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.
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