455A Datasheet, PDF (10/148 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

455A Group
Key-on wakeup
input
Edge detection
circuit
Register Y
SD instruction
RD instruction
Decoder
CLD
instruction
Skip decision
SZD instruction
S
RG2
RQ 1
0
Sub-clock input
Quartz-crystal
oscillation circuit
Register Y
SD instruction
RD instruction
RG2
Decoder
CLD
instruction
Skip decision
SZD instruction
S
RG2
RQ 1
0
K33
PU33
Pull-up
transistor
(Note 1)
XCIN/D6 (Note 2)
(Note 1)
PU33 ^Pull-up
transistor
(Note 1)
XCOUT/D7 (Note 2)
(Note 1)
K33
Key-on wakeup
input
Edge detection
circuit
Clock input for timer 1 event count
Timer 1 underflow signal
W41
D
TQ
R
W12
PWMOD
SCP instruction
RCP instruction
SQ
R
(Note 1)
C/CNTR (Note 2)
(Note 1)
W10
W11
Fig 4. Port block diagram (2)
Notes 1.
This symbol represents a parasitic diode on the port.
2. Applied potential to these ports must be VDD or less.
Rev.1.01 Feb 15, 2008 Page 10 of 146
REJ03B0224-0101