Datasheet

619
• Bits 1 and 0—PB8 Mode (PB8MD1 and PB8MD0): PB8MD1 and PB8MD0 select the
function of the PB8/IRQ6/A20/WAIT pin.
Bit 1: PB8MD1 Bit 0: PB8MD0 Description
0 0 General input/output (PB8) (initial value)
1 Interrupt request input (IRQ6)
1 0 Address output (A20) (PB8 in single chip mode)
1 Wait state request input (WAIT) (PB8 in single chip
mode)
Port B Control Register 2 (PBCR2):
Bit: 15 14 13 12 11 10 9 8
PB7MD1 PB7MD0 PB6MD1 PB6MD0 PB5MD1 PB5MD0 PB4MD1 PB4MD0
Initial value: 0 0 0 0 0 0 0 0
R/W: R/W R/W R/W R/W R/W R/W R/W R/W
Bit: 7 6 5 4 3 2 1 0
PB3MD1 PB3MD0 PB2MD1 PB2MD0 — PB1MD — PB0MD
Initial value: 0 0 0 0 0 0 0 0
R/W: R/W R/W R/W R/W R R/W R R/W
• Bits 15 and 14—PB7 Mode (PB7MD1 and PB7MD0): PB7MD1 and PB7MD0 select the
function of the PB7/IRQ5/A19/BREQ pin.
Bit 15:
PB7MD1
Bit 14:
PB7MD0 Description
0 0 General input/output (PB7) (initial value)
1 Interrupt request input (IRQ5)
1 0 Address output (A19) (PB7 in single chip mode)
1 Bus right request input (BREQ) (PB7 in single chip mode)