MITSUBISHI MICROCOMPUTERS
7470/7471 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Port P0
Pull-up control
register
Tr1
Direction register
Port latch
Data bus
Port P0
Interrupt control circuit
Ports P10–P13
Pull-up control
register
Data bus
Data bus
Tr2
T34M7
Direction register
Port latch
Port P13
T1
Tr3
T12M3
Direction register
Port latch
Data bus
Port P12
T0
Tr4
Direction register
Port latch
Data bus
Port P11
Tr5
Direction register
Port latch
Data bus
Port P10
Tr1–Tr5 are pull-up transistors
Fig. 17 Block diagram of ports P0, P10–P13
25