MITSUBISHI MICROCOMPUTERS
4250 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
PORT FUNCTION
Port
Port D
D
0
, D
1
D
2
/C
D
3
/K
Pin
Input/
Output
I/O
(4)
Output structure
N-channel open-drain
Control
bits
1
Control
instructions
SD
RD
SZD
CLD
SCP
RCP
SNZCP
OKA
Port S
S
0
–S
3
I/O
(4)
N-channel open-drain
4
IAK
OSA
IAS
LGOP
Port G
G
0
/INT
I/O
(4)
N-channel open-drain
4
OGA
IAG
PU0, K0
K0
LO
Logic operation function
(programmable)
Key-on wakeup functions
(programmable)
Pull-up functions
Key-on wakeup functions
(only pull-up function is
G
1
/T
OUT
G
2
, G
3
Port F
F
0
, F
1
I/O
(2)
N-channel open-drain
2
OFA
IAF
PU0, K0
V1
PU0, K0
programmable)
Pull-up functions
(programmable)
Key-on wakeup functions
(programmable)
Control
registers
PU0
Remark
Pull-up function
(programmable)
DEFINITION OF CLOCK AND CYCLE
• System clock
This is the source clock input to the X
IN
pin. Connect pins X
IN
and X
OUT
directly. Then, pull up X
IN
pin through a resistor and
pull down X
OUT
pin through a capacitor.
• Instruction clock
The instruction clock is a signal derived by dividing the system
clock by 4, and is the basic clock for controlling this product.
• Machine cycle
One machine cycle is the time required to execute the minimum
instruction (one-cycle instruction). The machine cycle is
equivalent to the instruction clock cycle.
6
RENESAS [ RENESAS TECHNOLOGY CORP ]
