r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 185

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

6.3.3
WTCRA and WTCRB select the number of program wait states for each area in the external
address space.
In addition, CAS latency is set when a synchronous DRAM is connected.
• WTCRAH
Bit
15
14
13
12
11
Bit Name
—
W72
W71
W70
—
Wait Control Registers AH, AL, BH, and BL (WTCRAH, WTCRAL, WTCRBH,
and WTCRBL)
Initial Value
0
1
1
1
0
R/W
R
R/W
R/W
R/W
R
Description
Reserved
This bit is always read as 0 and cannot be
modified.
Area 7 Wait Control 2 to 0
These bits select the number of program wait
states when accessing area 7 while AST7 bit in
ASTCR = 1.
000: Program wait not inserted
001: 1 program wait state inserted
010: 2 program wait states inserted
011: 3 program wait states inserted
100: 4 program wait states inserted
101: 5 program wait states inserted
110: 6 program wait states inserted
111: 7 program wait states inserted
Reserved
This bit is always read as 0 and cannot be
modified.
Rev. 1.00 Sep. 19, 2008 Page 155 of 1342
Section 6 Bus Controller (BSC)
REJ09B0467-0100