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AN1043
FIGURE 1:
I/O PORT BLOCK DIAGRAM
TABLE 1:
MEMORY MAP
V DD
8-bit Mode
16-bit Mode
Register
Address
Register
Address
MCP23X08/17
Name
(hex)
Name
(hex)
D
Q
Data Bus
Write
SET
CLR Q
OLAT or
GPIO
I/O
Pad
IODIRA
IPOLA
GPINTENA
DEFVALA
00
01
02
03
IODIRA
IODIRB
IPOLA
IPOLB
00
01
02
03
Write
D
SET
Q
Input
Buffer
INTCONA
04
GPINTENA
04
CLR
Q
IOCON
05
GPINTENB
05
IODIR
GPPUA
06
DEFVALA
06
Q
Q
SET
CLR
D
INTFA
INTCAPA
07
08
DEFVALB
INTCONA
07
08
Read
Port
8/16 BIT MODE (MCP23X17 ONLY)
The MCP23X17 has the unique ability to appear to the
MCU as either two (2) 8-bit GPIO expanders, or as a
single 16-bit GPIO expander.
This is accomplished by splitting the 16 I/O ports into
two separate 8-bit I/O ports (Port A and Port B) via
IOCON.bank.
shows how the register groups (Port A and Port B) are
mapped when in 8-bit or 16-bit mode.
GPIOA
OLATA
IODIRB
IPOLB
GPINTENB
DEFVALB
INTCONB
IOCON
GPPUA
INTFB
INTCAPB
GPIOB
09
0A
10
11
12
13
14
15
16
17
18
19
INTCONB
IOCON
IOCON
GPPUA
GPPUB
INTFA
INTFB
INTCAPA
INTCAPB
GPIOA
GPIOB
OLATA
09
0A
0B
0C
0D
0E
0F
10
11
12
13
14
Note:
Unlike all other registers which are not
OLATB
1A
OLATB
15
shared between the two ports (Port A and
Port B), there is one register (IOCON).
which is shared between the ports and
affects both equally.
8-Bit Mode:
When in 8-bit mode, the ports’ registers are separated:
? Port A register addresses range from 00h – 0Ah
? Port B register addresses range from 10h – 1Ah
16-bit Mode:
When in 16-bit mode, the ports’ registers are
interleaved to emulate 16-bit wide registers:
? Port A and Port B register addresses range from
00h – 15h. The registers are still addressed as
8-bit ports, meaning that the 16-bit mapping pair
is always an even number (e.g., IODIR starts at
00h, IPOL starts at 02h, etc.)
DS01043A-page 2
? 2006 Microchip Technology Inc.
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