HD64F3039F18 Datasheet, PDF (138/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Section 6 Bus Controller
6.2 Register Descriptions
6.2.1 Access State Control Register (ASTCR)
ASTCR is an 8-bit readable/writable register that selects whether each area is accessed in two
states or three states.
Bit
Initial value
Read/Write
7
AST7
1
R/W
6
AST6
1
R/W
5
AST5
1
R/W
4
AST4
1
R/W
3
AST3
1
R/W
2
AST2
1
R/W
1
AST1
1
R/W
0
AST0
1
R/W
Bits selecting number of states for access to each area
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 accessed in two or three states.
Bits 7 to 0
AST7 to AST0
0
1
Description
Areas 7 to 0 are accessed in two states
Areas 7 to 0 are accessed in three states
(Initial value)
ASTCR specifies the number of states in which external areas are accessed. On-chip memory and
registers are accessed in a fixed number of states that does not depend on ASTCR settings.
Therefore, in the single-chip modes (modes 6 and 7), the set value is meaningless.
Rev.3.00 Mar. 26, 2007 Page 114 of 682
REJ09B0353-0300