em78p862a ELAN Microelectronics Corp, em78p862a Datasheet - Page 7

• Manufacturer Part Number: em78p862a
• Description: 8-bit Risc Type Microprocessor
• Manufacturer: ELAN Microelectronics Corp

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This specification is subject to change without further notice.
General Description
Features
The EM78862B is an 8-bit RISC type microprocessor with low power, high speed CMOS
technology. Integrated into the single chip are on chip watchdog (WDT), RAM, ROM,
programmable real-time clock/counter, internal interrupt, power-down mode, LCD driver, and
tri-state I/O. The EM78862B provides a single chip solution for designing DATA-BANK of
message display.
The following table shows how EM78862B compares with other MCU’s of the same series.
2.1 CPU
ROM size
RAM size
LCD
LCD RAM
Oscillator
Code option
Pins number
OTP
Operating voltage range: 2.2V ~ 5.5V
16K X 13 on chip ROM
2.2K X 8 on chip RAM
Up to 29 bi-directional and tri-state I/O ports
8 level stack for subroutine nesting
8-bit real time clock/counter (TCC)
Two sets of 8 bit counters can be interrupt sources
Programmable free running on chip watchdog timer
Four modes (internal PLL clock 3.579MHz)
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Input port wake up function
Seven interrupt sources; 4 external, 3 internal
84-pin chip (EM78862BH)
Port key scan function
Clock frequency 32.768KHz or RC mode
Eight R-option pins
Item
SLEEP Mode:
IDLE Mode:
GREEN Mode: 3.579MHz clock turn off, CPU and 32.768KHz clock turn on
NORMAL Mode: 3.579MHz clock turn on, CPU and 32.768KHz clock turn on
16K X 13 bit
2.2K X 8 bit
60 X 9
Write only when LCD is enabled. Read/Write when disabled.
Crystal
MCLK
84
EM78P862A
CPU and 3.579MHz clock turn off, 32.768KHz clock turn off
CPU and 3.579MHz clock turn off, 32.768KHz clock turn on
EM78862
16K X 13 bit
2.2K X 8 bit
60 X 9
Crystal/RC
MCLK/OSCSEL
84
EM78P862A
EM78862B
8-Bit RISC Type Microprocessor
Crystal/RC
MCLK/ELCD/OSCSEL
64
EM78P862A
8K X 13 bit
0.7K X 8 bit
40 X 9
08.02.2004 (V1.0)
EM78869
EM78862B
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