HD6432670 Hitachi, HD6432670 Datasheet - Page 171

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

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.
Bit
15
14
13
12
11
WTCRAH
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. 2.0, 04/02, page 125 of 906