CHAPTER 4 BUS CONTROL FUNCTION
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User’s Manual U15195EJ5V0UD
(2) Address wait control register (AWC)
In the V850E/IA2, address setup wait and address hold wait states can be inserted before and after the T1
cycle, respectively.
These wait states can be set for each CS space via the AWC register.
This register can be read/written in 16-bit units.
Only the AHW0 and ASW0 bits are valid in the V850E/IA2. This register is not affected by other bit settings.
Caution Write to the AWC register after reset, and then do not change the set values.
CS4
CS0
AWC
CSn signal
15
AHW7
14
ASW7
13
AHW6
12
ASW6
11
AHW5
10
ASW5
9
AHW4
8
ASW4
7
AHW3
6
ASW3
5
AHW2
4
ASW2
3
AHW1
2
ASW1
1
AHW0
0
ASW0
Address
FFFFF488H
After reset
0000H
CS7
CS6
CS5
CS3
CS2
CS1
Bit position
Bit name
Function
15, 13, 11, 9,
7, 5, 3, 1
AHWn
(n = 0 to 7)
Sets the insertion of an address hold wait state in each CSn space after the T1 cycle.
0: Address hold wait state not inserted
1: Address hold wait state inserted
14, 12, 10, 8,
6, 4, 2, 0
ASWn
(n = 0 to 7)
Sets the insertion of an address setup wait state in each CSn space before the T1 cycle.
0: Address setup wait state not inserted
1: Address setup wait state inserted