CXP80712A/80716A/80720A/80724A
PIn
Circuit format
When reset
SCK0
1 pin
EXTAL
XTAL
2 pins
TEX
TX
2 pins
RST
1 pin
MP
1 pin
Internal serial clock
from SIO
SCK0 output enable
IP
External serial clock to SIO
Schmitt input
Hi-Z
EXTAL
XTAL
TEX
TX
• Shows the circuit
composition during
oscillation.
IP
• Feedback resistor is
removed during stop.
XTAL becomes "H"
level.
Oscillation
• Shows the circuit
32kHz
composition during
timer counter oscillation.
IP
• Feedback resistor is
removed during 32kHz
oscillation circuit stop
Oscillation
by software.
At this time TEX pin
outputs "L" level and TX
pin outputs "H" level.
Mask option
Pull-up resistor
Schmitt input
OP
IP
L level
IP
CPU mode
Hi-Z
– 11 –