MAX7300 Maxim, MAX7300 Datasheet - Page 14

• Manufacturer Part Number: MAX7300
• Description: The MAX7300 compact, serial-interfaced, I/O expansion peripheral provides microprocessors with up to 28 ports
• Manufacturer: Maxim

2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or
28-Port I/O Expander
Table 5. Register Address Map (continued)
Note: Unused bits read as zero.
14
Port 26 only (data bit D0. D7-D1 read as 0)
Port 27 only (data bit D0. D7-D1 read as 0)
Port 28 only (data bit D0. D7-D1 read as 0)
Port 29 only (data bit D0. D7-D1 read as 0)
Port 30 only (data bit D0. D7-D1 read as 0)
Port 31 only (data bit D0. D7-D1 read as 0)
4 ports 4–7 (data bits D0–D3. D4–D7 read as 0)
5 ports 4–8 (data bits D0–D4. D5–D7 read as 0)
6 ports 4–9 (data bits D0–D5. D6–D7 read as 0)
7 ports 4–10 (data bits D0–D6. D7 reads as 0)
8 ports 4–11 (data bits D0–D7)
8 ports 5–12 (data bits D0–D7)
8 ports 6–13 (data bits D0–D7)
8 ports 7–14 (data bits D0–D7)
8 ports 8–15 (data bits D0–D7)
8 ports 9–16 (data bits D0–D7)
8 ports 10–17 (data bits D0–D7)
8 ports 11–18 (data bits D0–D7)
8 ports 12–19 (data bits D0–D7)
8 ports 13–20 (data bits D0–D7)
8 ports 14–21 (data bits D0–D7)
8 ports 15–22 (data bits D0–D7)
8 ports 16–23 (data bits D0–D7)
8 ports 17–24 (data bits D0–D7)
8 ports 18–25 (data bits D0–D7)
8 ports 19–26 (data bits D0–D7)
8 ports 20–27 (data bits D0–D7)
8 ports 21–28 (data bits D0–D7)
8 ports 22–29 (data bits D0–D7)
8 ports 23–30 (data bits D0–D7)
8 ports 24–31 (data bits D0–D7)
7 ports 25–31 (data bits D0–D6. D7 reads as 0)
6 ports 26–31 (data bits D0–D5. D6–D7 read as 0)
5 ports 27–31 (data bits D0–D4. D5–D7 read as 0)
4 ports 28–31 (data bits D0–D3. D4–D7 read as 0)
3 ports 29–31 (data bits D0–D2. D3–D7 read as 0)
2 ports 30–31 (data bits D0–D1. D2–D7 read as 0)
1 port 31 only (data bits D0. D1–D7 read as 0)
______________________________________________________________________________________
REGISTER
D15
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
D14
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
1
1
1
1
1
1
D13
1
1
1
1
1
1
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
COMMAND ADDRESS
D12
1
1
1
1
1
1
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
1
1
1
1
1
1
D11
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
1
1
1
1
1
1
D10
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
0
0
1
1
1
1
D9
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
1
1
0
0
1
1
D8
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
0
1
0
1
0
1
CODE
0x3C
0x3D
0x4C
0x4D
0x5C
0x5D
0x3A
0x3B
0x3E
0x4A
0x4B
0x4E
0x5A
0x5B
0x5E
HEX
0x3F
0x40
0x41
0x42
0x43
0x44
0x45
0x46
0x47
0x48
0x49
0x4F
0x50
0x51
0x52
0x53
0x54
0x55
0x56
0x57
0x58
0x59
0x5F