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4571 Datasheet(PDF) 9 Page - Renesas Technology Corp

Part # 4571
Description  SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
PDF  126 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

4571 Datasheet(HTML) 9 Page - Renesas Technology Corp

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Rev.1.02
May 25, 2007
Page 9 of 124
REJ03B0179-0102
4571 Group
Fig 4.
Port block diagram (2)
Edge detection
circuit
Key-on wakeup input
IAP1 instruction
OP1A instruction
(Note 1)
(Note 1)
P10
-P13(Note 2)
D
T
Q
K1i
PU1i
Ai
Register A
Ai
(Note 3)
(Note 3)
(Note 4)
(Note 3)
Pull-up
transistor
IAP2 instruction
OP2A instruction
(Note 1)
(Note 1)
PU20
P20/INT0(Note 2)
D
T
Q
External 0 interrupt
External 0 interrupt
Key-on wakeup input
Timer 1 count start
synchronous circuit input
(Notes 5, 6)
A0
Register A
A0
Edge detection
circuit
Key-on wakeup input
K20
(Note 4)
IAP2 instruction
OP2A
instruction
(Note 1)
(Note 1)
PU21
P21/INT1(Note 2)
D
T
Q
External 1 interrupt
External 1 interrupt
Key-on wakeup input
A1
Register A
A1
Edge detection
circuit
Key-on wakeup input
K21
(Note4)
Pull-up
transistor
Pull-up
transistor
(Notes 5, 6)
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.



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