4571 Datasheet, PDF (9/126 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4571 Group
(Note 4)
Key-on wakeup input
Edge detection
circuit
(Note 3)
IAP1 instruction
Register A
Ai
Ai
D
OP1A instruction T Q
K1i (Note 3) Pull-up
transistor
PU1i
(Note 3)
(Note 1)
P10-P13(Note 2)
(Note 1)
Key-on wakeup input
(Note 4)
Edge detection
circuit
Register A
A0
IAP2 instruction
A0
D
OP2A instruction T Q
K20
Pull-up
transistor
PU20
(Note 1)
P20/INT0(Note 2)
(Note 1)
External 0 interrupt
Key-on wakeup input
Timer 1 count start
synchronous circuit input
Key-on wakeup input
External 0 interrupt
(Notes 5, 6)
(Note4)
K21
Edge detection
circuit
IAP2 instruction
Register A
A1
A1
D
OP2A T Q
instruction
External 1 interrupt
Key-on wakeup input
External 1 interrupt
(Notes 5, 6)
Pull-up
transistor
PU21
(Note 1)
P21/INT1(Note 2)
(Note 1)
Notes 1.
This symbol represents a parasitic diode on the port.
2. Applied potential to these ports must be V DD or less.
3. i represents bits 0 to 3.
4. Falling edge of port input is detected.
5. As for details, refer to the external interrupt structure.
6. The threshold value of port input is different from that of external interrupt input.
Fig 4. Port block diagram (2)
Rev.1.02 May 25, 2007 Page 9 of 124
REJ03B0179-0102