SH7014 datasheet(487/754 Pages) RENESAS

487 / 754 page

16. Pin Function Controller (PFC)

Rev.5.00 Sep. 27, 2007 Page 453 of 716

REJ09B0398-0500

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:

⎯

Initial value:

R/W:

Bit:

⎯

PB9

MD1

PB9

MD0

PB8

MD1

PB8

MD0

Initial value:

R/W:

R/W

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