71M6542F MAXIM [Maxim Integrated Products], 71M6542F Datasheet - Page 75
71M6542F
Manufacturer Part Number
71M6542F
Description
0.1% Accuracy Over 2000:1 Current Range Energy Meter ICs
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
1.71M6542F.pdf
(166 pages)
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Command Sequence
ADDR 1xxx xxxx STATUS
Byte0 ... ByteN
0xxx xxxx ADDR Byte0 ...
ByteN
(From Host) SPI_CSZ
(From Host) SPI_CSZ
(From 654x) SPI_DO
(From 654x) SPI_DO
(From Host) SPI_CK
(From Host) SPI_CK
SERIAL READ
SERIAL WRITE
(From Host) SPI_DI
(From Host) SPI_DI
x
Figure 27: SPI Slave Port - Typical Multi-Byte Read and Write operations
A15
A15
0
0
A14
A14
16 bit Address
16 bit Address
A1
A1
HI Z
HI Z
15
15
A0
A0
Description
Read data starting at ADDR. ADDR auto-increments until SPI_CSZ is
raised. Upon completion, SPI_CMD (SFR 0xFD) is updated to 1xxx xxxx
and an SPI interrupt is generated. The exception is if the command byte
is 1000 0000. In this case, no MPU interrupt is generated and SPI_CMD
is not updated.
Write data starting at ADDR. ADDR auto-increments until SPI_CSZ is
raised. Upon completion, SPI_CMD is updated to 0xxx xxxx and an SPI
interrupt is generated. The exception is if the command byte is 0000
0000. In this case, no MPU interrupt is generated and SPI_CMD is not
updated.
Table 63: SPI Command Sequences
16
16
C7
C7
C6
C6
8 bit CMD
8 bit CMD
C5
C5
23
23
C0
C0
ST7
ST7
24
24
ST6
ST6
Status Byte
Status Byte
ST5
ST5
71M6541D/F/G and 71M6542F/G Data Sheet
ST0
ST0
31
31
32
32
D7
D7
x
D6
D6
DATA[ADDR]
DATA[ADDR]
D1
D1
D0
D0
39
39
D7
D7
40
40
Extended Read . . .
Extended Write . . .
DATA[ADDR+1]
D6
DATA[ADDR+1]
D6
D1
D1
47
D0
47
D0
x
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