Hitachi SH7032 - Column Address Strobe Pin Control Register (CASCR)

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15.3.5 Column Address Strobe Pin Control Register (CASCR)
CASCR is a 16-bit read/write register that allows selection between column address strobe and
chip select pin functions. CASCR is initialized to H'5FFF by a power-on reset, but is not
initialized by a manual reset, or in standby mode or sleep mode.
Bit: 15 14 13 12 11 10 9 8
Bit name: CASH
MD1
CASH
MD0
CASL
MD1
CASL
MD0
————
Initial value: 0 1 0 1 1 1 1 1
R/W: R/W R/W R/W R/W — — — —
Bit: 7 6 5 4 3 2 1 0
Bit name: — — — — — — — —
Initial value: 1 1 1 1 1 1 1 1
R/W: — — — — — — — —
• Bits 15 and 14 (CASH Mode (CASHMD1 and CASHMD0)): CASHMD1 and CASHMD0
select the function of the CS1/CASH pin.
Bit 15:
CASHMD1
Bit 14:
CASHMD0 Function
0 0 Reserved
1 Chip select output (CS1) (Initial value)
1 0 Column address strobe output (CASH)
1 Reserved
• Bits 13 and 12 (CASL Mode (CASLMD1 and CASLMD0)): CASLMD1 and CASLMD0
select the function of the CS3/CASL pin.
Bit 13:
CASLMD1
Bit 12:
CASLMD0 Function
0 0 Reserved
1 Chip select output (CS3) (Initial value)
1 0 Column address strobe output (CASL)
1 Reserved
• Bits 11–0 (Reserved): These bits are always read as 1. The write value should always be 1.