
HITACHI 408
14.3.4
Port B Control Registers (PBCR1 and PBCR2)
PBCR1 and PBCR2 are 16-bit read/write registers that select the functions of the sixteen
multiplexed pins of port B. PBCR1 selects the function of the top eight bits of port B; PBCR2
selects the function of the bottom eight bits of port B. PBCR1 and PBCR2 are initialized to
H'0000 by power-on resets but are not initialized for manual resets, standby mode, or sleep mode.
PBCR1:
Bit:
15
14
13
12
11
10
9
8
Bit name:
PB15
MD1
PB15
MD0
PB14
MD1
PB14
MD0
PB13
MD1
PB13
MD0
PB12
MD1
PB12
MD0
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
Bit name:
PB11
MD1
PB11
MD0
PB10
MD1
PB10
MD0
PB9
MD1
PB9
MD0
PB8
MD1
PB8
MD0
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
Bits 15 and 14 (PB15 mode (PB15MD1 and PB15MD0)): PB15MD1 and PB15MD0 select the
function of the PB15/TP15/
IRQ7
pin.
Bit 15: PB15MD1
Bit 14: PB15MD0
Function
0
0
Input/output (PB15) (initial value)
Interrupt request input (
IRQ7
)
1
1
0
Reserved
1
Timing pattern output (TP15)
Bits 13 and 12 (PB14 mode (PB14MD1 and PB14MD0)): PB14MD1 and PB14MD0 select the
function of the PB14/TP14/
IRQ6
pin.
Bit 13: PB14MD1
Bit 12: PB14MD0
Function
0
0
Input/output (PB14) (initial value)
Interrupt request input (
IRQ6
)
1
1
0
Reserved
1
Timing pattern output (TP14)