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关于EM78447S：
EM78447S is an 8-bit microprocessor with low-power and high-speed CMOS technology. Integrated into a single chip are on-chip watchdog timer (WDT), RAM, ROM, real time clock/counter, external and interrupt, power down mode, and tri-state I/O.
EM78447S FEATURES
Operating voltage range: 2.3V~5.5V.
Operating in temperature range: 0°C~70°C.
Operating frequency range ( base on 2 clocks)
* Crystal mode: DC~20MHz at 5V, DC~8MHz at 3V, DC~4MHz at 2.3V.
* RC mode: DC~4MHz at 5V, DC~4MHz at 3V, DC~4MHz at 2.3V.
Low power consumption:
* Less then 2.2 mA at 5V/4MHz
* Typically 30 mA at 3V/32KHz
* Typically 1 mA during sleep mode
4K ? 13 bits on chip ROM
One configuration register to accommodate user’s requirements
148? 8 bits on chip registers (SRAM, general purpose register)
3 bi-directional I/O ports
5 level stacks for subroutine nesting
8-bit real time clock/counter (TCC) with selective signal sources, trigger edges, and overflow interrupt
Two clocks per instruction cycle
Power down (SLEEP) mode
Two available interruptions
* TCC overflow interrupt
* External interrupt
Programmable free running watchdog timer
10 programmable pull-high pins
2 programmable open-drain pins
2 programmable R-option pins
Package types:
* 28 pin DIP 600mil :EM78447SAP
* 28 pin SOP(SOIC) 300mil :EM78447SAM
* 28 pin SSOP 209mil :EM78447SAS
* 32 pin DIP 300mil :EM78447SBP
* 32 pin SOP(SOIC) 450mil :EM78447SBWM
99.9% single instruction cycle commands
The transient point of system frequency between HXT and LXT is around 400KHz
