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EM6622 Schematic ( PDF Datasheet ) - EM Microelectronic

Teilenummer EM6622
Beschreibung Ultra-low power microcontroller
Hersteller EM Microelectronic
Logo EM Microelectronic Logo 




Gesamt 30 Seiten
EM6622 Datasheet, Funktion
EM MICROELECTRONIC - MARIN SA
EM6622
Ultra Low Power Microcontroller with 4x32 LCD Driver
Features
Low Power - 3.0 µA active mode, LCD On
- 0.6 µA standby mode, LCD Off
- 0.2 µA sleep mode
@ 1.5 V, 32 KHz, 25 ºC
Low Voltage - 1.2 to 3.6 V
2 clocks per instruction cycle
72 basic instructions
ROM 4k x 16 bits
RAM 128 x 4 bits
Max. 12 inputs ; port A, port B, port SP
Max. 8 outputs ; port B, port SP
Voltage Level Detector, 8 levels software
selectable from 1.2 V up to 4.0 V
Melody, 7 tones + silence inclusive 4-bit timer
Universal 10-bit counter, PWM, event counter
Prescaler down to 1 second ( crystal = 32 KHz )
1/1000 sec 12 bit binary coded decimal counter
with hard or software start/stop function
LCD 32 Segments, 3 or 4 times multiplexed
3 wire serial port , 8 bit, master and slave mode
5 external interrupts (port A, serial interface)
8 internal interrupts (3x prescaler, BCD counter
2x10-bit counter, melody timer, serial interface)
timer watchdog and oscillation supervisor
Description
The EM6622 is an advanced single chip low cost
CMOS 4-bit microcontroller. It contains ROM, RAM,
LCD driver, power on reset, watchdog timer,
oscillation detection circuit, 10-bit up/down and
event counter, 1ms BCD counter, prescaler, voltage
level detector (Vld), serial interface and several
clock functions. The low voltage feature and low
power consumption make it the most suitable
controller for battery, stand alone and mobile
equipment. The EM6622 is manufactured using EM
Microelectronic's advanced low power (ALP) CMOS
process.
Typical Applications
Timing device
Automotive controls with display
Intelligent display driver
Measurement equipment
Domestic appliance
Interactive system with display
Timer / sports timing devices
Bicycle computers
Safety and security devices
Figure 1. Architecture
Figure 2. Pin Configuration, TQFP64 10 * 10 * 1 mm
Copyright 2002, EM Microelectronic-Marin SA
1
03/02 REV. C/445
www.emmicroelectronic.com






EM6622 Datasheet, Funktion
EM6622
2. Operating Modes
The EM6622 has two low power dissipation modes, standby and sleep.
these modes.
Figure 4 is a transition diagram for
2.1 Active Mode
The active mode is the actual CPU running mode. Instructions are read from the internal ROM and executed by
the CPU. Leaving active mode via the halt instruction to go into standby mode, the Sleep bit write to go into
Sleep mode or a reset from port A to go into reset mode.
2.2 Standby Mode
Executing a halt instruction puts the EM6622
into standby mode. The voltage regulator,
oscillator, watchdog timer, LCD, interrupts,
timers and counters are operating. However,
the CPU stops since the clock related to
instruction execution stops. Registers, RAM
and I/O pins retain their states prior to
standby mode. Standby is canceled by a
reset or an interrupt request if enabled.
Figure 4 Mode transition diagram
Halt
instruction
Active
IRQ
Sleep bit
write
2.3 Sleep Mode
Standby
Reset=1
Reset=0
Sleep
Writing to the Sleep bit in the RegSysCntl1
register puts the EM6622 in sleep mode. The
oscillator stops and most functions of the
Reset=1
Reset=1
EM6622 are inactive. To be able to write to
the Sleep bit, the SleepEn bit in
Reset
RegSysCntl2 must first be set to "1". In
sleep mode only the voltage regulator and
the reset input are active. The RAM data integrity is maintained. Sleep mode may be canceled only by a high
level of min 10µs at the EM6622 Reset terminal or by the selected port A input reset combination, if option
InpResSleep is turned on.
Due to the cold-start characteristics of the oscillator, waking up from sleep mode may take some time to
guarantee stable oscillation. During sleep mode and the following start up the EM6622 is in reset state. Waking
up from sleep clears the Sleep flag but not the SleepEn bit. Inspecting the SleepEn allows to determine if the
EM6622 was powered up (SleepEn = "0") or woken up from sleep (SleepEn = "1").
Table 2.3.1. Internal State in Standby and Sleep Mode
Function
Oscillator
Oscillator Watchdog
Instruction Execution
Interrupt Functions
Registers and Flags
RAM Data
Option Registers
Timer & Counter
Logic Watchdog
I/O Port B and Serial Port
Input Port A
LCD
Strobe Output
Buzzer Output
Voltage Level Detector
Reset Pin
Standby
Active
Active
Stopped
Active
Retained
Retained
Retained
Active
Active
Active
Active
Active
Active
Active
Finishes ongoing measure, then stop
Active
Sleep
Stopped
Stopped
Stopped
Stopped
Reset
Retained
Retained
Reset
Reset
High Impedance,
Pull’s as defined in option register
No pull-downs and inputs deactivated
except if InpResSleep = "1"
Stopped (display off)
Active
High Impedance
Stopped
Active
Copyright 2002, EM Microelectronic-Marin SA
6
03/02 REV. C/445
www.emmicroelectronic.com

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EM6622 pdf, datenblatt
EM6622
5. Oscillator and Prescaler
5.1 Oscillator
A built-in crystal oscillator generates the system operating clock for the CPU and peripheral blocks, from an
externally connected crystal (typically 32.768kHz). The oscillator circuit is supplied by the regulated voltage,
Vreg. In sleep mode the oscillator is stopped.
EM’s special design techniques guarantee the low current consumption of this oscillator. The external
impedance between the oscillator pads must be greater than 10MOhm. Connection of any other components to
the two oscillator pads must be confirmed by EM Microelectronic-Marin SA.
5.2 Prescaler
The prescaler consists of fifteen elements divider chain which delivers clock signals for the peripheral circuits
such as timer/counter, buzzer, LCD voltage multiplier, debouncer and edge detectors, as well as generating
prescaler interrupts. The input to the prescaler is the system clock signal. Power on initializes the prescaler to
Hex(0001).
Table 5.2.1 Prescaler Clock Name Definition
Function
System clock
System clock / 2
System clock / 4
System clock / 8
System clock/ 16
System clock / 32
System clock / 64
System clock / 128
Name
Ck[16]
Ck[15]
Ck[14]
Ck[13]
Ck[12]
Ck[11]
Ck[10]
ck [9]
32 KHz Xtal
32768 Hz
16384 Hz
8192 Hz
4096 Hz
2048 Hz
1024 Hz
512 Hz
256 Hz
Function
System clock / 256
System clock / 512
System clock / 1024
System clock / 2048
System clock / 4096
System clock / 8192
System clock / 16384
System clock / 32768
Name
Ck[8]
Ck[7]
Ck[6]
Ck[5]
Ck[4]
Ck[3]
Ck[2]
Ck[1]
32 KHz Xtal
128 Hz
64 Hz
32 Hz
16 Hz
8 Hz
4 Hz
2 Hz
1 Hz
Table 5.2.2 Control of Prescaler Register RegPresc
Bit Name
Reset R/W Description
3 PWMOn 0
R/W see 10 bit counter
2 ResPresc 0
R/W Write Reset prescaler
1 -> Resets the divider chain
from Ck[14] down to
Ck[2], sets Ck[1].
0 -> No action.
1 PrIntSel 0
0 DebSel 0
The Read value is always '0'
R/W Interrupt select.
0 -> Interrupt from Ck[4]
1 -> Interrupt from Ck[6]
R/W Debouncer clock select.
0 -> Debouncer with Ck[8]
1 -> Debouncer with Ck[11]
or Ck[14]
Figure 8. Prescaler Frequency Timing
Prescaler Reset
System Clock
Ck[16]
Ck[15]
Ck[14]
Ck[2]
Ck[1]
Horizontal Scale Change
First positive edge of 1 Hz clock is 1s after
the falling reset edge
With DebSel = 1 one may choose either the Ck[11] or Ck[14] debouncer frequency by selecting the
corresponding metal mask option. Relative to 32kHz the corresponding max. debouncer times are then 2 ms or
0.25 ms. For the metal mask selection refer to chapter 18.1.6.
Switching the PrIntSel may generate an interrupt request. Avoid it with MaskIRQ32/8 = 0 selection during the
switching operation.
Copyright 2002, EM Microelectronic-Marin SA
12
03/02 REV. C/445
www.emmicroelectronic.com

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