Port Control Register 7 (Pcr7); Pin Functions - Hitachi H8/3664 Hardware Manual

9.5.4

Port Control Register 7 (PCR7)

Bit
Initial value
Read/Write
PCR7 is an 8-bit register for controlling whether each of the port 7 pins P76 to P74 functions as an
input pin or output pin. Setting a PCR7 bit to 1 makes the corresponding pin an output pin, while
clearing the bit to 0 makes the pin an input pin.
Upon reset, PCR7 is initialized to H'00.
PCR7 is a write-only register, which always reads as all 1s.
9.5.5

Pin Functions

Table 9.8 shows the port 7 pin functions.
Table 9.8 Port 7 Pin Functions
Pin Pin Functions and Selection Method
P76/TMOV The pin function depends on bit PCR76 in PCR7 and bits OS3 to OS0 in
TCSRV.
OS3 to OS0
PCR76
Pin function
P75/TMCIV The pin function depends on bit PCR75 in PCR7.
PCR75
Pin function
P74/TMRIV The pin function depends on bit PCR74 in PCR7.
PCR74
Pin function
Note: * Don't care
7 6
— PCR76 PCR75
0 0
— W
P76 input pin P76 output pin
5 4
PCR74
0 0
W W
0000
0 1
0
P75 input pin
TMCIV input pin
0
P74 input pin
TMRIV input pin
3 2
— —
0 0
— —
Not 0000
TMOV output pin
P75 output pin
P74 output pin
1 0
— —
0 0
— —
*
1
1
155