W90N740CD WINBOND [Winbond], W90N740CD Datasheet - Page 53

• Manufacturer Part Number: W90N740CD
• Description: 32-Bit ARM7TDMI-Based Micro-Controller
• Manufacturer: WINBOND [Winbond]

External I/O Control Registers（EXT0CON – EXT3CON）
The W90N740 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.
BASADDR [31:19] ：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.
SIZE [18:16] ：The size of the external I/O bank 0~3
REGISTER
EXT0CON
EXT1CON
EXT2CON
EXT3CON
ADRS
31
23
15
7
0
0
0
0
1
1
1
1
0xFFF0.101C
0xFFF0.1018
0xFFF0.1020
0xFFF0.1024
tACS
ADDRESS
30
22
14
6
SIZE [18:16]
0
0
1
1
0
0
1
1
BASADDR
29
21
13
5
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
R/W
tACC
28
20
12
0
1
0
1
0
1
0
1
4
BASADDR
- 50 -
W90N740CD/W90N740CDG
tCOS
DESCRIPTION
27
19
11
3
26
18
10
2
256K
512K
Byte
16M
32M
1M
2M
4M
8M
tCOH
SIZE
25
17
9
1
RESET VALUE
DBWD
0x0000.0000
0x0000.0000
0x0000.0000
0x0000.0000
24
16
8
0