SH7020 Datasheet, PDF (427/509 Pages) Renesas Technology Corp – SuperH™ RISC engine

14.3.5 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. The CASCR is initialized to H'5FFF by power-on resets but is not
initialized for manual resets, standby mode, or sleep mode.
Bit: 15
14
13
12
11
10
9
8
Bit name: CASH CASH CASL CASL —
—
—
—
MD1 MD0 MD1 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
0
1
Bit 14: CASHMD0
0
1
0
1
Function
Reserved
Chip select output (CS1) (initial value)
Column address strobe output (CASH)
Reserved
• Bits 13 and 12 (CASL mode (CASLMD1 and CASLMD0)): CASLMD1 and CASLMD0
select the function of the CS3/CASL pin.
Bit 13: CASLMD1
0
1
Bit 12: CASLMD0
0
1
0
1
Function
Reserved
Chip select output (CS3) (initial value)
Column address strobe output (CASL)
Reserved
• Bits 11–0 (reserved): This bit always reads as 1. The write value should always be 1.
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