HD6433937 Datasheet, PDF (168/521 Pages) Hitachi Semiconductor – Hardware Manual

8.5.3 Pin Functions
Table 8-12 shows the port 4 pin functions.
Table 8-12 Port 4 Pin Functions
Pin
P4₃/IRQ₀
P4₂/TXD₃₂
P4₁/RXD₃₂
P4₀/SCK₃₂
Pin Functions and Selection Method
The function depends on bit IRQ0 in PMR3.
IRQ0
Function
0
P4₃ input
1
IRQ₀ input
The pin function depends on bit TE in SCR32, bit SPC32 in SPCR, and bit
PCR4₂ in PCR4.
SPC32
0
1
TE
0
1
PCR4₂
Pin function
0
P4₂ input pin
1
P4₂ output pin
*
TXD₃₂ output pin
The pin function depends on bit RE in SCR32 and bit PCR41 in PCR4.
RE
PCR4₁
Pin function
0
0
1
P4₁ input pin P4₁ output pin
1
*
RXD₃₂ input pin
The pin function depends on bits CKE1 and CKE0 in SCR32, bit COM32 in
SMR32, and bit PCR4₀ in PCR4.
CKE1
0
1
CKE0
0
1
*
COM32
0
1*
*
PCR4₀
Pin function
0
P4₀ input pin
1
P4₀ output pin
*
SCK₃₂
output pin
*
SCK₃₂
input pin
*: Don’t care
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