Column Address Strobe Pin Control Register (Cascr) - Hitachi SH7032 Hardware Manual

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:
Bit name:
Initial value:
R/W:
Bit:
Bit name:
Initial value:
R/W:
• Bits 15 and 14 (CASH Mode (CASHMD1 and CASHMD0)): CASHMD1 and CASHMD0
select the function of the CS1/CASH pin.
Bit 15: Bit 14:
CASHMD1 CASHMD0
0 0
1
1 0
1
• Bits 13 and 12 (CASL Mode (CASLMD1 and CASLMD0)): CASLMD1 and CASLMD0
select the function of the CS3/CASL pin.
Bit 13: Bit 12:
CASLMD1 CASLMD0
0 0
1
1 0
1
• Bits 11–0 (Reserved): These bits are always read as 1. The write value should always be 1.
15 14
CASH CASH CASL
MD1 MD0 MD1
0 1
R/W R/W R/W
7 6
— —
1 1
— —
Function
Reserved
Chip select output (CS1)
Column address strobe output (CASH)
Reserved
Function
Reserved
Chip select output (CS3)
Column address strobe output (CASL)
Reserved
13 12 11
CASL —
MD0
0 1 1
R/W —
5 4 3
— — —
1 1 1
— — —
10 9 8
— — —
1 1 1
— — —
2 1 0
— — —
1 1 1
— — —
(Initial value)
(Initial value)
439