SH7708 Datasheet, PDF (219/625 Pages) Renesas Technology Corp – SuperH™ RISC engine

initialized by a manual reset or in standby mode. Do not access external memory outside area 0
until BCR2 register initialization is complete.
Bit: 15
Bit name: —
Initial value: 0
R/W: R
14
13
12
11
10
9
8
— A6SZ1 A6SZ0 A5SZ1 A5SZ0 A4SZ1 A4SZ0
0
1
1
1
1
1
1
R
R/W R/W R/W R/W R/W R/W
Bit: 7
Bit name: A3SZ1
Initial value: 1
R/W: R/W
6
A3SZ0
1
R/W
5
A2SZ1
1
R/W
4
A2SZ0
1
R/W
3
A1SZ1
1
R/W
2
A1SZ0
1
R/W
1
0
— PORTEN
0
0
—
R/W
Bits 15, 14, 1—Reserved: These bits always read 0. The write value should always be 0.
Bits 2n + 1, 2n—Area n (1–6) Bus Size Specification (AnSZ1, AnSZ0): These bits specify the
bus sizes of physical space area n (n = 1 to 6).
Bit 2n + 1:
AnSZ1
0
1
0
1
Bit 2n: AnSZ0 Bit 0: PORTEN Description
0
0
Reserved (not settable)
1
Byte (8-bit) size
0
Word (16-bit) size
1
Longword (32-bit) size
(Initial
value)
0
1
Reserved (not settable)
1
Byte (8-bit) size
0
Word (16-bit) size
1
Reserved (not settable)
Bit 0—Port Function Enable (PORTEN): Designates whether to use the D23–D16 pins as an 8-bit
port. When using this function set the bus widths to word or byte in all areas.
Bit 0: PORTEN
0
1
Description
D23–D16 are not used as a port.
D23–D16 are used as a port.
(Initial value)
1 0 . 2 . 3 Wait State Control Register 1 (WCR1)
205