W90N745CD Datasheet, PDF (77/422 Pages) Winbond – 16/32-bit ARM microcontroller

W90N745CD/W90N745CDG
External I/O Control Registers（EXT0CON – EXT3CON）
The W90N745 supports an external device control without glue logic. It is very cost effective because
address decoding and control signals timing logic are not needed. Using these control registers you can
configure special external I/O devices for providing the low cost external devices control solution.
REGISTER
EXT0CON
EXT1CON
EXT2CON
EXT3CON
ADDRESS
0xFFF0_1018
0xFFF0_101C
0xFFF0_1020
0xFFF0_1024
R/W
DESCRIPTION
R/W External I/O 0 control register
R/W External I/O 1 control register
R/W External I/O 2 control register
R/W External I/O 3 control register
RESET VALUE
0x0000_0000
0x0000_0000
0x0000_0000
0x0000_0000
31
23
15
ADRS
7
30
22
14
6
tACS
29
28
27
BASADDR
21
20
19
BASADDR
13
12
11
tACC
5
4
3
tCOS
26
25
24
18
17
16
SIZE
10
9
8
tCOH
2
1
0
DBWD
BITS
[31:11]
[18:16]
BASADDR
SIZE
DESCRIPTION
Base address pointer of external I/O bank 0~3
The start address of each external I/O bank is calculated as “BASADDR”
base pointer << 18.
Each external I/O bank base address pointer together with the “SIZE” bits
constitutes the whole address range of each external I/O bank.
The size of the external I/O bank 0~3
SIZE [18:16]
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Byte
256K
512K
1M
2M
4M
8M
REVERSED
REVERSED
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