参数资料
型号: 71M6542F-IGT/F
厂商: Maxim Integrated
文件页数: 72/166页
文件大小: 0K
描述: IC ENERGY METERING
标准包装: 90
系列: *
71M6541D/F/G and 71M6542F/G Data Sheet
Control
Bit
4
Name
RD
Read/
Write
W
Description
Indicates that EEDATA ( SFR 0x9E ) is to be filled with data from EEPROM.
Specifies the number of clocks to be issued. Allowed values are 0
through 8. If RD=1, CNT bits of data are read MSB first, and right
3:0
CNT[3:0]
W
justified into the low order bits of EEDATA . If RD=0, CNT bits are sent
MSB first to the EEPROM, shifted out of the MSB of EEDATA . If
CNT[3:0] is zero, SDATA simply obeys the HiZ bit.
The timing diagrams in Figure 22 through Figure 26 describe the 3-wire EEPROM interface behavior. All
commands begin when the EECTRL ( SFR 0x9F ) register is written. Transactions start by first raising the
DIO pin that is connected to CS. Multiple 8-bit or less commands such as those shown in Figure 22
through Figure 26 are then sent via EECTRL and EEDATA .
When the transaction is finished, CS must be lowered. At the end of a Read transaction, the EEPROM is
driving SDATA, but transitions to Hi-Z (high impedance) when CS falls. The firmware should then
immediately issue a write command with CNT=0 and HiZ=0 to take control of SDATA and force it to a
low-Z state.
EECTRL Byte Written
Write -- No HiZ
SCLK (output)
CNT Cycles (6 shown)
INT5
SDATA (output)
D7
D6
D5
D4
D3
D2
SDATA output Z
(LoZ)
BUSY (bit)
Figure 22: 3-Wire Interface. Write Command, HiZ=0.
EECTRL Byte Written
Write -- With HiZ
SCLK (output)
CNT Cycles (6 shown)
INT5
SDATA (output)
D7
D6
D5
D4
D3
D2
SDATA output Z
(LoZ)
(HiZ)
BUSY (bit)
Figure 23: 3-Wire Interface. Write Command, HiZ=1
EECTRL Byte Written
READ
SCLK (output)
CNT Cycles (8 shown)
INT5
SDATA (input)
D7
D6
D5
D4
D3
D2
D1
D0
SDATA output Z
(HiZ)
BUSY (bit)
Figure 24: 3-Wire Interface. Read Command.
72
Rev 4
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