HD6412332 RENESAS [Renesas Technology Corp], HD6412332 Datasheet - Page 165

• Manufacturer Part Number: HD6412332
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

6.2.2
ASTCR is an 8-bit readable/writable register that designates each area as either 2-state access
space or 3-state access space.
ASTCR sets the number of access states for the external memory space. The number of access
states for on-chip memory and internal I/O registers is fixed regardless of the settings in ASTCR.
ASTCR is initialized to H'FF by a reset, and in hardware standby mode. It is not initialized in
software standby mode.
Bits 7 to 0—Area 7 to 0 Access State Control (AST7 to AST0): These bits select whether the
corresponding area is to be designated as 2-state access space or 3-state access space.
Wait state insertion is enabled or disabled at the same time.
Bit n
ASTn
0
1
(n = 7 to 0)
6.2.3
WCRH and WCRL are 8-bit readable/writable registers that select the number of program wait
states for each area.
Program waits are not inserted in on-chip memory or internal I/O register access.
WCRH and WCRL are initialized to H'FF by a reset, and in hardware standby mode. They are not
initialized in software standby mode.
Bit
Initial value :
R/W
Access State Control Register (ASTCR)
Wait Control Registers H and L (WCRH, WCRL)
:
:
Description
Area n is designated for 2-state access
Wait state insertion in area n external space access is disabled
Area n is designated for 3-state access
Wait state insertion in area n external space access is enabled
AST7
R/W
7
1
AST6
R/W
6
1
AST5
R/W
5
1
AST4
R/W
1
4
Rev.4.00 Sep. 07, 2007 Page 135 of 1210
AST3
R/W
3
1
AST2
R/W
2
1
REJ09B0245-0400
AST1
R/W
1
1
(Initial value)
AST0
R/W
0
1