HD6433044 Datasheet, PDF (283/867 Pages) Hitachi Semiconductor – Hitachi Single-Chip Microcomputer

Table 9-14 Port 8 Pin Functions in Modes 1 to 6
Pin
P8₄/CS₀
P8₃/CS₁/IRQ₃
P8₂/CS₂/IRQ₂
P8₁/CS₃/IRQ₁
P8₀/RFSH/IRQ₀
Pin Functions and Selection Method
Bit P8₄DDR selects the pin function as follows
P8₄DDR
Pin function
0
P8₄ input
1
CS₀ output
Bit P8₃DDR selects the pin function as follows
P8₃DDR
Pin function
0
P8₃ input
IRQ₃ input
1
CS₁ output
Bit P8₂DDR selects the pin function as follows
P8₂DDR
Pin function
0
P8₂ input
IRQ₂ input
1
CS₂ output
Bit P8₁DDR selects the pin function as follows
P8₁DDR
Pin function
0
P8₁ input
IRQ₁ input
1
CS₃ output
Bit RFSHE in RFSHCR and bit P8₀DDR select the pin function as follows
RFSHE
P8₀DDR
Pin function
0
0
1
P8₀ input
P8₀ output
IRQ₀ input
1
—
RFSH output
270