SH7014 Datasheet, PDF (487/754 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

16. Pin Function Controller (PFC)
16.3.4 Port B Control Registers (PBCR1 and PBCR2)
PBCR1 and PBCR2 are 16-bit read/write registers that select the functions of the ten multiplexed
pins of port B (eight pins in the SH7014). PBCR1 selects the functions of the top two bits of port
B; PBCR2 selects the functions of the bottom eight bits of port B (six bits in the SH7014).
Port B includes bus control signals (RDWR, RAS, CASH, CASL, and WAIT) and address outputs
(A21 to A16), but in the SH7016 and SH7017, settings in these registers relating to the selection
of these pin functions may be invalid in single-chip mode. For details, see table 16.3, Pin
Functions in Each Operating Mode.
PBCR1 and PBCR2 are both initialized to H'0000 by external power-on reset but are not
initialized for reset by WDT, standby mode, or sleep mode, so the previous data is maintained.
The settings of bits 2 and 0 of PBCR2 are functional only in the SH7016 and SH7017. In the
SH7014, there are no pins corresponding to these bits; they are always read as 0, and their write
value should always be 0.
Port B Control Register 1 (PBCR1):
Bit: 15
14
13
12
11
10
9
8
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
Initial value: 0
0
0
0
0
0
0
0
R/W: R
R
R
R
R
R
R
R
Bit: 7
6
5
4
3
2
1
0
⎯
⎯
⎯
⎯
PB9 PB9 PB8 PB8
MD1 MD0 MD1 MD0
Initial value: 0
0
0
0
0
0
0
0
R/W: R
R
R
R
R/W R/W R/W R/W
Rev.5.00 Sep. 27, 2007 Page 453 of 716
REJ09B0398-0500