參數(shù)資料
型號(hào)： M44C892
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20
封裝： SSO-20
文件頁(yè)數(shù)： 57/84頁(yè)
文件大?。?/td> 643K
代理商： M44C892
M44C892
M44C092
Rev. A5, 14-Dec-01
60 (84)
Serial Interface Status and Control Register (SISC)
Primary register address: ’A’hex
Bit 3
Bit 2
Bit 1
Bit 0
SISC
write
MCL
RACK
SIM
IFN
Reset value: 1111b
SISC
read
– – –
TACK
ACT
SRDY
Reset value: xxxxb
MCL
Multi-Chip Link activation
MCL = 1,
multi-chip link disabled. This bit has to be set to ’0’ during transactions to/from
EEPROM of the M44C892
MCL = 0,
connnects SC and SD additional to the internal multi-chip link pads
RACK
Receive ACKnowledge status/control bit for I2C mode
RACK = 0,
transmit acknowledge in next receive telegram
RACK = 1,
transmit no acknowledge in last receive telegram
TACK
Transmit ACKnowledge status/control bit for I2C mode
TACK = 0,
acknowledge received in last transmit telegram
TACK = 1,
no acknowledge received in last transmit telegram
SIM
Serial Interrupt Mask
SIM = 1,
disable interrupts
SIM = 0,
enable serial interrupt. An interrupt is generated.
IFN
Interrupt FuNction
IFN = 1,
the serial interrupt is generated at the end of telegram
IFN = 0,
the serial interrupt is generated when the SRDY goes low (i.e., buffer becomes
empty/full in transmit/receive mode)
SRDY
Serial interface buffer ReaDY status flag
SRDY = 1,
in receive mode:
receive buffer empty
in transmit mode:
transmit buffer full
SRDY = 0,
in receive mode:
receive buffer full
in transmit mode:
transmit buffer empty
ACT
Transmission ACTive status flag
ACT = 1,
transmission is active, i.e., serial data transfer. Stop or start conditions are currently in
progress.
ACT = 0,
transmission is inactive
Serial Transmit Buffer (STB) – Byte Write
Primary register address: ’9’hex
STB
First write cycle
Bit 3
Bit 2
Bit 1
Bit 0
Reset value: xxxxb
Second write cycle
Bit 7
Bit 6
Bit 5
Bit 4
Reset value: xxxxb
The STB is the transmit buffer of the SSI. The SSI transfers the transmit buffer into the shift register and starts shifting
with the most significant bit.
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