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PDF EM78468B Data sheet ( Hoja de datos )
| Número de pieza | EM78468B | |
| Descripción | 8-Bit Microcontroller | |
| Fabricantes | ELAN Microelectronics | |
| Logotipo |  |
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EM78468B
8-Bit Microcontroller
Product
Specification
DOC. VERSION 1.0
ELAN MICROELECTRONICS CORP.
January 2013
1 page  
EM78468B
8-Bit Microcontroller
1 General Description
The EM78468B is an 8-bit microprocessor designed and developed with low-power and high-speed CMOS
technology. Integrated onto a single chip are on-chip Watchdog Timer (WDT), Data RAM, ROM,
programmable real time clock counter, internal/external interrupt, power-down mode, LCD driver, infrared
transmitter function, and tri-state I/O. The series has an on-chip 4K×13-bit Electrical Mask Read Only
Memory (Mask-ROM). The EM78468B provides multi-protection bits to prevent intrusion of user’s Mask
memory code. Seven Code option bits are available to meet user’s requirements. Special 13 bits customer
ID options are provided as well.
With its enhanced Mask-ROM feature, the EM78468B provides a convenient way of developing and
verifying user’s programs. Moreover, this Mask device offers the advantages of easy and effective program
updates, using development and programming tools. User can avail of the ELAN Writer to easily program
his development code.
2 Features
CPU Configuration
• 4K×13 bits on-chip Mask-ROM
• 144 bytes general purpose register
• 128 bytes on-chip data RAM
• 272 bytes SRAM
• 8 level stacks for subroutine nesting
• Power-on voltage detector provided
(1.7±0.1V) for EM78468B
I/O Port Configuration
• Typically, 12 bi-directional tri-state I/O ports.
• 16 bi-directional tri-state I/O ports shared
with LCD segment output pin.
• Up to 28 bi-directional tri-state I/O ports
Operating Voltage and Temperature Range:
• Commercial: 2.1 V ~ 5.5 V. (at 0°C ~+70°C)
• Industrial: 2.3V ~ 5.5 V. (at -40°C ~+85°C)
Operating Mode:
• Normal mode: The CPU is operated on main
oscillator frequency (Fm)
• Green mode: The CPU is operated on
sub-oscillator frequency (Fs) and main
oscillator (Fm) is stopped
• Idle mode: CPU idle, LCD display remains
working
• Sleep mode: The whole chip stops working
♦ Input port wake-up function (Port 6, Port 8).
Works on Idle and Sleep mode.
♦ Operation speed: DC ~ 10 MHz clock input
♦ Dual clock operation
Oscillation Mode
• High frequency oscillator can select among
Crystal, RC, or PLL (phase lock loop)
• Low frequency oscillator can select between
Crystal or RC mode
Peripheral Configuration
• 8-bit real time clock/counter (TCC)
• One infrared transmitter / PWM generator
function
• Four sets of 8 bits auto reload down-count
timer can be used as interrupt sources
♦ Counter 1: independent down-count timer
♦ Counter 2, High Pulse Width Timer
(HPWT), and Low Pulse Width Timer
(LPWT) shared with IR function.
♦ Programmable free running on chip
watchdog timer (WDT). This function can
operate on Normal, Green and Idle mode.
Eight Interrupt Sources: Three External and
Five Internal
• Internal interrupt source: TCC; Counters 1, 2;
High/Low pulse width timer.
• External interrupt source : INT0, INT1 and
Pin change wake-up (Port 6 and Port 8)
LCD Circuit
• Common driver pins: 4
• Segment driver pins: 32
• LCD Bias: 1/3, 1/2 bias
• LCD Duty: 1/4, 1/3, 1/2 duty
Package Type:
• Dice form: 59 pins
• QFP-64 pin: EM78468BQxS/xJ
(Body 14mm × 20mm)
• LQFP-64 pin: EM78468BAQxS/xJ
(Body 7mm × 7mm)
Note: These are Green products which do not
contain hazardous substances.
Product Specification (V1.0) 01.31.2013
(This specification is subject to change without further notice)
•1
5 Page 
EM78468B
8-Bit Microcontroller
Symbol
Function
SEG30
Input
Type
−
SEG30/P86
P86
ST
SEG31/P87
SEG31
P87
−
ST
VB
VA
VLCD2
VLCD3
VB
VA
VLCD2
VLCD3
−
−
−
−
/RESET
/RESET ST
R-OSCI
R-OSCI AN
OSCO
Xin
Xout
NC
VDD
GND
OSCO
−
Xin XTAL
Xout
−
NC
VDD
GND
−
Power
Power
Output
Type
Description
AN LCD segment output pin
CMOS
Bidirectional I/O pin with programmable
pull-high. All pins wake up from Sleep and Idle
modes when the pin status changes
AN LCD segment output pin
CMOS
Bidirectional I/O pin with programmable
pull-high. All pins wake up from Sleep and Idle
modes when the pin status changes
AN Connects capacitors for LCD bias voltage
AN Connects capacitors for LCD bias voltage
AN One of LCD bias voltage
AN One of LCD bias voltage
−
−
XTAL
General-purpose Input only
Low active. If it remains at logic low, the device
will reset.
In Crystal mode: crystal input
In RC mode: resistor pull high
In PLL mode: connect a 0.01µF capacitance to
GND
Connect a 0.01 µF capacitor to GND and code
option selects PLL mode when high oscillator is
not used.
In Crystal mode: crystal input
In RC mode: instruction clock output
In Crystal mode: Input pin for sub-oscillator.
− Connect to a 32.768kHz crystal.
XTAL
In Crystal mode: Connect to a 32.768kHz
crystal.
In RC mode: instruction clock output
− No connection
− Power
− Ground
Legend: ST: Schmitt Trigger input
AN: analog pin
CMOS: CMOS output
XTAL: oscillation pin for crystal / resonator
Product Specification (V1.0) 01.31.2013
(This specification is subject to change without further notice)
•7
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet EM78468B.PDF ] | |
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