Fully CMOS static design
? 8-bit data bus
? On chip ROM size : 2 K words
? Internal RAM size : 80 bytes
(72 general purpose, 8 special
registers)
? 36 single word instructions
? 14-bit instructions
? 2-level stacks
? Operating voltage : 2.3 V ~ 5.5 V
? Operating frequency : 0 ~ 20 MHz
? The most fast execution time is 200 ns
under 20 MHz in all single cycle
instructions except the branch
instructions.
? Addressing modes include direct,
indirect and relative addressing modes
? Power-on Reset (POR)
? 4 types of power edge-detector reset:
1.8v , 2.1v , always enable 1.8v and
Disable
? Sleep mode for power saving
? 2 oscillator start-up time :
EXT-R、RC：150 μs,20ms
XT、LF ：20ms,80ms
? 8-bit real time clock/counter(RTCC)
with 8-bit programmable prescaler
? 4 types of oscillator can be selected by
user options :
RC－Low cost RC oscillator
LFXT－Low frequency crystal
oscillator
XTAL－Standard crystal oscillator
EXT-R－Low cost R oscillator
? On-chip RC oscillator based Watchdog
Timer(WDT) can be operated freely
? 20 I/O pins with their own independent
direction control
? 20 I/O pins own independent weak
pull-high and can be enabled by
software.
? WDT can be enabled by software if
WDT Disable is selected in user
option.