MITSUBISHI MICROCOMPUTERS
7477/7478 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Port P2
Data bus
Port P2
Multi-
plexer
A-D conversion circuit
Port P3
Data bus
Port P3
INT0, INT1
CNTR0, CNTR1
Port P4
* : Control in units of 4-bit (Control in units of 2-bit for the 7477 group)
Pull-up control register*
Data bus
Tr10
Direction register
Port latch
Data bus
Port P4
Tr10 is pull-up transistor
Fig. 21 Block diagram of ports P2 – P4
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