HD6473837H Datasheet, PDF (171/562 Pages) Renesas Technology Corp – 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/TXD
P4₁/RXD
P4₀/SCK₃
Pin Functions and Selection Method
The pin function depends on the IRQ0 bit setting in PMR2.
IRQ0
0
1
Pin function
P4₃ input pin
IRQ₀ input pin
The pin function depends on bit TE in SCR3 and bit PCR4₂ in PCR4.
TE
0
1
PCR4₂
Pin function
0
1
P4₂ input pin P4₂ output pin
*
TXD output pin
The pin function depends on bit RE in SCR3 and bit PCR4₁ in PCR4.
RE
0
1
PCR4₁
Pin function
0
1
P4₁ input pin P4₁ output pin
*
RXD input pin
The pin function depends on bits CKE1 and CKE0 in SCR3, bit COM in SMR,
and bit PCR4₀ in PCR4.
CKE1
0
1
CKE0
0
1
*
COM
0
1
*
*
PCR4₀
Pin function
0
P4₀ input
pin
1
P4₀ output
pin
*
SCK₃ output
pin
*
SCK₃ input
pin
Note: * Don’t care
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