MAX7301 Maxim, MAX7301 Datasheet - Page 10

• Manufacturer Part Number: MAX7301
• Description: The MAX7301 compact, serial-interfaced I/O expander (or general-purpose I/O (GPIO) peripheral) provides microprocessors with up to 28 ports
• Manufacturer: Maxim

4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and
28-Port I/O Expander
Table 3. Register Address Map
10
No-Op
Configuration
Transition Detect Mask
Factory Reserved. Do not write to this.
Port Configuration P7, P6, P5, P4
Port Configuration P11, P10, P9, P8
Port Configuration P15, P14, P13, P12
Port Configuration P19, P18, P17, P16
Port Configuration P23, P22, P21, P20
Port Configuration P27, P26, P25, P24
Port Configuration P31, P30, P29, P28
Port 0 only (virtual port, no action)
Port 1 only (virtual port, no action)
Port 2 only (virtual port, no action)
Port 3 only (virtual port, no action)
Port 4 only (data bit D0. D7–D1 read as 0)
Port 5 only (data bit D0. D7–D1 read as 0)
Port 6 only (data bit D0. D7–D1 read as 0)
Port 7 only (data bit D0. D7–D1 read as 0)
Port 8 only (data bit D0. D7–D1 read as 0)
Port 9 only (data bit D0. D7–D1 read as 0)
Port 10 only (data bit D0. D7–D1 read as 0)
Port 11 only (data bit D0. D7–D1 read as 0)
Port 12 only (data bit D0. D7–D1 read as 0)
Port 13 only (data bit D0. D7–D1 read as 0)
Port 14 only (data bit D0. D7–D1 read as 0)
Port 15 only (data bit D0. D7–D1 read as 0)
Port 16 only (data bit D0. D7–D1 read as 0)
Port 17 only (data bit D0. D7–D1 read as 0)
Port 18 only (data bit D0. D7–D1 read as 0)
Port 19 only (data bit D0. D7–D1 read as 0)
Port 20 only (data bit D0. D7–D1 read as 0)
Port 21 only (data bit D0. D7–D1 read as 0)
Port 22 only (data bit D0. D7–D1 read as 0)
Port 23 only (data bit D0. D7–D1 read as 0)
Port 24 only (data bit D0. D7–D1 read as 0)
Port 25 only (data bit D0. D7–D1 read as 0)
______________________________________________________________________________________
REGISTER
D15
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
D14
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D13
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
COMMAND ADDRESS
D12
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
D11
0
0
0
0
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
D10
0
1
1
1
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
D9
0
0
1
1
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
D8
0
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
CODE
0x2C
0x2D
0x0A
0x0B
0x0C
0x0D
0x2A
0x2B
0x2E
HEX
0x00
0x04
0x06
0x07
0x09
0x0E
0x0F
0x20
0x21
0x22
0x23
0x24
0x25
0x26
0x27
0x28
0x29
0x2F
0x30
0x31
0x32
0x33
0x34
0x35
0x36
0x37
0x38
0x39