CHAPTER 5 BUS CONTROL FUNCTION
Preliminary User’s Manual U15905EJ1V0UD
194
5.6.4
Programmable address wait function
Address-setup or address-hold waits to be inserted in each bus cycle can be set by using the address wait control
register (AWC). Address wait insertion is set for each chip select area (CS0 to CS3).
If an address setup wait is inserted, it seems that the high-clock period of T1 state is extended by 1 clock. If an
address hold wait is inserted, it seems that the low-clock period of T1 state is extended by 1 clock.
(1) Address wait control register (AWC)
This register can be read or written in 16-bit units.
After reset:
FFFFH R/W
Address:
FFFFF488H
1
AHW3
AHWn
0
1
Not inserted
Inserted
AWC
1
ASW3
1
AHW2
1
ASW2
1
AHW1
1
ASW1
1
AHW0
1
ASW0
8
9
10
11
12
13
Specifies insertion of address hold wait (n = 0 to 3)
14
15
1
2
3
4
5
6
7
0
ASWn
0
1
Not inserted
Inserted
Specifies insertion of address setup wait (n = 0 to 3)
CS0
CS3
CSn signal
CS2
CS1
Caution
Be sure to set bits 15 to 8 to 1.
Содержание V850ES/SA2 UPD703201
Страница 2: ...Preliminary User s Manual U15905EJ1V0UD 2 MEMO ...
Страница 284: ... 4 6 7 6 7 8 9 9 6 Note 1 Note 2 0 0 9 9 6 1 1 0 1 9 0 0 0 6 7 0 0 0 0 0 0 0 1 1 1 0 0 0 0 3 1 6 7 6 7 ...
Страница 285: ... 6 7 ...
Страница 516: ...Preliminary User s Manual U15905EJ1V0UD 516 MEMO ...