Datasheet

© 2009 Microchip Technology Inc. DS22153C-page 25
MCP9843/98243
FIGURE 5-5: Timing Diagram for Writing and Reading from the T
UPPER
Register (See Section 4.0
“Serial Communication”).
SDA
A
C
K
0011
A
T
UPPER
Pointer
0000
A
C
K
S
2
A
1
A
0
12345678 12345678
SCL
0
Address Byte
A
C
K
0011
A
MSB Data
A
C
K
N
A
K
S P
2
A
1
A
0
12345678 12345678 12345678
Address Byte
LSB Data
R
MCP9843/98243
MCP9843/98243
MCP9843/98243
Master
Master
W
SDA
SCL
010
00000
101 10100
000
• Reading from the T
UPPER
Register.
• Writing 90°C to the T
UPPER
Register <0000 0101 1010 0000>b.
SDA
A
C
K
0011
A
0000
A
C
K
S
2
A
1
A
0
12345678 12345678
SCL
0
Address Byte
W
MCP9843/98243
MCP9843/98243
MSB Data
A
C
K
A
C
K
P
12345678 12345678
LSB Data
T
UPPER
Pointer
MCP9843/98243
MCP9843/98243
010
00000
101 10100
000
Note: It is not necessary to
select the register
pointer if it was set from
the previous read/write.