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EM6821 Schematic ( PDF Datasheet ) - MARIN SA

Teilenummer EM6821
Beschreibung Ultra Low Power uController
Hersteller MARIN SA
Logo MARIN SA Logo 




Gesamt 30 Seiten
EM6821 Datasheet, Funktion
R EM MICROELECTRONIC - MARIN SA
www.DataSheet4U.com
EM6821
Ultra Low Power µController with 4x20 LCD Driver
Features
Low Power - 1.3 µA active mode, LCD On
- 0.4 µA standby mode, LCD Off
- 0.1 µA sleep mode
@ 3 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 20 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 EM6821 is an advanced single chip low cost
CMOS 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 EM6821 is manufactured
using EM Microelectronic’a advanced low power
(ALP) CMOS process.
Typical Applications
Timing device
Timer / sports timing devices
Bicycle computers
Measurement equipment
Domestic appliance
Interactive system with display
Automotive controls with display
Safety and security devices
Figure 1. Architecture
Figure 2. Pin Configuration, TQFP52 10x10x1 mm
Copyright © 2005, EM Microelectronic-Marin SA
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EM6821 Datasheet, Funktion
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EM6821
2. Operating Modes
The EM6821 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 EM6821
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. A reset or an interrupt
request if enabled cancels standby.
Figure 4 Mode transition diagram
Halt
instruction
Active
Standby
IRQ
Reset=1
Reset=0
Sleep bit
write
Sleep
2.3 Sleep Mode
Writing to the Sleep bit in the RegSysCntl1
register puts the EM6821 in sleep mode. The
Reset=1
Reset=1
oscillator stops and most functions of the
EM6821 are inactive. To be able to write to
Reset
the Sleep bit, the SleepEn bit in
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 EM6821 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 EM6821 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
EM6821 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 © 2005, EM Microelectronic-Marin SA
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EM6821 pdf, datenblatt
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EM6821
The prescaler contains 3 interrupt sources:
Figure 9. Prescaler Interrupts
- IRQ32/8 ; this is Ck[6] or Ck[4] positive edge interrupt,
the selection is depending on bit PrIntSel.
- IRQHz1 ; this is Ck[1] positive edge interrupt
- IRQBlink ; this is 3/4 of Ck[1] period interrupt
Ck[2]
There is no interrupt generation on reset.
The first IRQHz1 Interrupt occurs 1 sec (32kHz)
after reset.
Ck[1]
IRQHz1
IR Q B lin k
A possible application for the IRQBlink is LCD-Display
blinking control together with IRQHz1.
Copyright © 2005, EM Microelectronic-Marin SA
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