4554 Datasheet, PDF (9/138 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4554 Group
PORT BLOCK DIAGRAMS
Clock (input) for timer 3 event count
PWMOD
SCP instruction
RCP instruction
Register Y
W31
W30
SQ
(Note 1)
C/CNTR1 (Notes 2 and 3)
R
Decoder
D
QRT
Timer 3 underflow signal
W32
W61
Skip decision
(SZD instruction)
SD instruction
RD instruction
CLD
instruction
Register Y
Decoder
FR10
S
RQ
Skip decision
(SZD instruction)
(Note 1)
D0 (Note 2)
SD instruction
RD instruction
CLD
instruction
Register Y
Decoder
FR11
S
RQ
Skip decision
(SZD instruction)
(Note 1)
D1 (Note 2)
SD instruction
RD instruction
CLD
instruction
FR12
S
RQ
(Note 1)
D2 (Note 2)
Register Y
Decoder
SD instruction
RD instruction
CLD
instruction
Skip decision
(SZD instruction)
FR13
S
RQ
(Note 1)
D3 (Note 2)
Notes 1:
This symbol represents a parasitic diode on the port.
2: Applied potential to these ports must be VDD or less.
3: When CNTR1 input is selected, output transistor is turned OFF.
Port block diagram (1)
Rev.3.00 Aug 06, 2004 page 9 of 136
REJ03B0043-0300Z