MIC2593
Micrel
duremaybeused. ToperformaReceive_Byteoperation, the
host sends an address byte to select the slave MIC2593, with
the R/W bit set to the high (read) state, and then retrieves the
data byte. Figures 9 through 11 show the formats for these
data read and data write procedures.
Inputs
MIC2593 Slave Address
A2
0
A1
0
A0
0
Binary
1000 000
1000 001
1000 010
1000 011
1000 100
1000 101
1000 110
1000 111
Hex
80
b
b
b
b
b
b
b
b
h
0
0
1
82
h
The Command Register is eight bits (one byte) wide. This
byte carries the address of the MIC2593’s register to be
operated upon. The command byte values corresponding to
the various MIC2593 register addresses are shown in Table
4. Command byte values other than 0000 0XXX = 00 - 07
h
0
1
0
84
h
0
1
1
86
h
1
0
0
88
h
b
h
1
0
1
8A
are reserved and should not be used.
h
1
1
0
8C
h
1
1
1
8E
h
Table 3. MIC2593 SMBus Addressing
MIC2593 Register Set and Programmer’s Model
Target Register
Command Byte Value Power-On
Default
Label
Description
Read
Write
n/a
RESERVED
RESERVED
CNTRLA
CNTRLB
STATA
Do not Use
00
01
02
03
04
05
06
n/a
n/a
h
h
h
h
h
h
h
Do not Use
n/a
Control Register Slot A
Control Register Slot B
Slot A Status
02
00
h
h
03
00
h
h
04
00
h
h
STATB
Slot B Status
05
00
h
h
CS
Common Status Register
Reserved / Do Not Use
06
xxxx 0000
h
b
Reserved
07 - FF
07 - FF
Undefined
h
h
h
h
Table 4. MIC2593 Register Addresses
MIC2593 Slave Address
Command Byte to MIC2593
Data Byte to MIC2593
S
1
0
0
1
A2 A1 A0
0
A
0
0
0
0
0
0
X
X
A
D7 D6 D5 D4 D3 D2 D1 D0 A P
DATA
CLK
R/W = WRITE
ACKNOWLEDGE
ACKNOWLEDGE
ACKNOWLEDGE
START
STOP
Master to slave transfer,
i.e., DATA driven by master.
Slave to master transfer,
i.e., DATA driven by slave.
Figure 9. WRITE_BYTE Protocol
MIC2593 Slave Address
Command Byte to MIC2593
MIC2593 Slave Address
Data Read From MIC2593
S
1
0
0
1 A2 A1 A0 0
A
0
0
0
0
0
0
X
X
A
S
1
0
0
1 A2 A1 A0 1
A
D7 D6 D5 D4 D3 D2 D1 D0 /A P
DATA
CLK
R/W = WRITE
ACKNOWLEDGE
ACKNOWLEDGE
R/W = READ
ACKNOWLEDGE NOT ACKNOWLEDGE
START
START
STOP
Master to slave transfer,
i.e., DATA driven by master.
Slave to master transfer,
i.e., DATA driven by slave.
Figure 10. READ_BYTE Protocol
Byte Read from MIC2593
MIC2593 Slave Address
S
1
0
0
1
A2 A1 A0
1
A
D7 D6 D5 D4 D3 D2 D1 D0 /A P
DATA
CLK
R/W = READ
ACKNOWLEDGE NOT ACKNOWLEDGE
START
STOP
Master to slave transfer,
i.e., DATA driven by master.
Slave to master transfer,
i.e., DATA driven by slave.
Figure 11. RECEIVE_BYTE Protocol
April 2004
15
M9999-042204
STMICROELECTRONICS [ ST ]
