HD64F2149 Datasheet, PDF (278/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

Pin
Selection Method and Pin Functions
PA4/A20/PS2BC/ The pin function is switched as shown below according to the combination of
KIN12/CIN12
operating mode, the KBIOE bit in KBCR1H of the keyboard buffer controller,
the IOSE bit in SYSCR, and bit PA4DDR.
Operating Modes 1, 2 (EXPE = 0), 3
mode
Mode 2 (EXPE = 1)
KBIOE
0
1
0
1
PA4DDR
0
1
—
0
1
—
IOSE
—
—
—
—
0
1
—
Pin function
PA4
input
pin
PA4 PS2BC
output output
pin
pin
PA4
input
pin
A20 PA4 PS2BC
output output output
pin
pin
pin
KIN12 input pin, CIN12 input pin, PS2BC input pin
When the IICS bit in STCR is set to 1, this pin functions as a bus buffer. This
pin can always be used as the PS2BC, KIN12, or CIN12 input pin.
PA3/A19/PS2AD/ The pin function is switched as shown below according to the combination of
KIN11/CIN11
operating mode, the KBIOE bit in KBCR0H of the keyboard buffer controller,
the IOSE bit in SYSCR, and bit PA3DDR.
Operating Modes 1, 2 (EXPE = 0), 3
mode
Mode 2 (EXPE = 1)
KBIOE
0
1
0
1
PA3DDR
0
1
—
0
1
—
IOSE
—
—
—
—
0
1
—
Pin function
PA3
input
pin
PA3 PS2AD
output output
pin
pin
PA3
input
pin
A19 PA3 PS2AD
output output output
pin
pin
pin
KIN11 input pin, CIN11 input pin, PS2AD input pin
This pin can always be used as the PS2AD, KIN11, or CIN11 input pin.
244