MCP23S18 Microchip Technology, MCP23S18 Datasheet - Page 13

• Manufacturer Part Number: MCP23S18
• Description: 16-Bit I/O Expander
• Manufacturer: Microchip Technology

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FIGURE 1-5:
1.4.2
The MCP23018 is a slave I
bit slave addressing, with the read/write bit filling out
the control byte. The slave address contains four fixed
bits and three user-defined hardware address bits (pins
A2, A1, and A0).
format.
1.4.3
The MCP23S18 is a slave SPI device. The slave
address contains seven fixed bits(no address bits) with
the read/write bit filling out the control byte.
shows the control byte format.
© 2008 Microchip Technology Inc.
i2c_clk
i2c_addr[2:0]
V
adc_en
DD
ADDRESSING I
(MCP23018)
ADDRESSING SPI DEVICES
(MCP23S18)
Figure 1-6
t
ADEN
HARDWARE ADDRESS DECODE TIMING
2
C device that supports 7-
t
2
ADDRLAT
shows the control byte
C DEVICES
Figure 1-7
MCP23018/MCP23S18
FIGURE 1-6:
FIGURE 1-7:
Start
bit
CS
S
t
ADDIS
0
0
R/W = 0 = write
R/W = 1 = read
R/W = 0 = write
R/W = 1 = read
1
1
Slave Address
Slave Address
0
0
Control Byte
Control Byte
I
FORMAT
SPI CONTROL BYTE
FORMAT
0
2
0
C™ CONTROL BYTE
A2 A1 A0 R/W ACK
0
R/W bit
ACK bit
R/W bit
0
DS22103A-page 13
0
R/W