HD64F2145 Datasheet, PDF (235/829 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

• PA4/A20/.,145/CIN12/PS2BC
The pin function is switched as shown below according to the combination of operating mode,
the KBIOE bit in KBCRH_1 of the keyboard buffer controller, the IOSE bit in SYSCR, and
the PA4DDR bit.
Operating
Mode
Modes 1, 2 (EXPE = 0), 3
Mode 2 (EXPE = 1)
KBIOE
0
1
0
1
PA4DDR
0
1
—
0
1
—
IOSE
—
—
—
—
0
1
—
Pin
Function
PA4
PA4
PS2BC
PA4
A20
PA4
PS2BC
input pin output pin output pin input pin output pin output pin output pin
.,145 input pin, CIN12 input pin, PS2BC input pin*
Note:* When the KBIOE bit is set to 1 or the IICS bit in STCR is set to 1, this pin is an NMOS
open-drain output, and has direct bus drive capability. This pin can always be used as the
PS2BC, .,145, or CIN12 input pin.
• PA3/A19/.,144/CIN11/PS2AD
The pin function is switched as shown below according to the combination of operating mode,
the KBIOE bit in KBCRH_0 of the keyboard buffer controller, the IOSE bit in SYSCR, and
the PA3DDR bit.
Operating
Mode
Modes 1, 2 (EXPE = 0), 3
Mode 2 (EXPE = 1)
KBIOE
0
1
0
1
PA3DDR
0
1
—
0
1
—
IOSE
—
—
—
—
0
1
—
Pin
Function
PA3 PA3 output PS2AD
PA3 A19 output PA3 output PS2AD
input pin
pin
output pin input pin
pin
pin
output pin
.,144 input pin, CIN11 input pin, PS2AD input pin*
Note:* When the KBIOE bit is set to 1, this pin is an NMOS open-drain output, and has direct bus
drive capability. This pin can always be used as the PS2AD, .,144, or CIN11 input pin.
Rev. 2.0, 08/02, page 195 of 788