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SH7052 Datasheet(PDF) 149 Page - Renesas Technology Corp

Part # SH7052
Description  SuperHTM RISC engine
PDF  919 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7052 Datasheet(HTML) 149 Page - Renesas Technology Corp

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123
• Bit 1—CS1 Space Size Specification (A1SZ): Specifies the CS1 space bus size. A 0 setting
specifies byte (8-bit) size, and a 1 setting specifies word (16-bit) size.
Bit 1: A1SZ
Description
0
Byte (8-bit) size
1
Word (16-bit) size
(Initial value)
• Bit 0—CS0 Space Size Specification (A0SZ): Specifies the CS0 space bus size A 0 setting
specifies byte (8-bit) size, and a 1 setting specifies word (16-bit) size.
Bit 0: A0SZ
Description
0
Byte (8-bit) size
1
Word (16-bit) size
(Initial value)
Note:
A0SZ is valid only in on-chip ROM enabled mode. In on-chip ROM disabled mode, the CS0
space bus size is specified by the mode pin.
8.2.2
Bus Control Register 2 (BCR2)
Bit:
15
14
13
12
11
10
9
8
IW31
IW30
IW21
IW20
IW11
IW10
IW01
IW00
Initial value:
1
1
1
1
1
1
1
1
R/W:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit:
7
6
5
4
3
2
1
0
CW3
CW2
CW1
CW0
SW3
SW2
SW1
SW0
Initial value:
1
1
1
1
1
1
1
1
R/W:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
BCR2 is a 16-bit readable/writable register that specifies the number of idle cycles and
CS signal
assert extension of each CS space.
BCR2 is initialized to H'FFFF by a power-on reset and in hardware standby mode. It is not
initialized by a manual reset or in software standby mode.
• Bits 15 to 8—Idles between Cycles (IW31, IW30, IW21, IW20, IW11, IW10, IW01, IW00):
These bits specify idle cycles inserted between consecutive accesses when the second one is to
a different CS area after a read. Idles are used to prevent data conflict between ROM (and
other memories, which are slow to turn the read data buffer off), fast memories, and I/O
interfaces. Even when access is to the same area, idle cycles must be inserted when a read
access is followed immediately by a write access. The idle cycles to be inserted comply with



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