參數(shù)資料
型號(hào)： UPD72042BGT
廠商： NEC Corp.
英文描述： LSI DEVICES FOR Inter Equipment BusTM (IEBusTM) PROTOCOL CONTROL
中文描述： LSI器件間設(shè)備BusTM（IEBusTM）協(xié)議控制
文件頁(yè)數(shù)： 22/92頁(yè)
文件大?。?/td> 541K
代理商： UPD72042BGT
μ
PD72042A, 72042B
22
DATA SHEET S13990EJ2V0DS00
3. MICROCOMPUTER INTERFACE
3.1 TRANSFER METHOD
Either of two microcomputer interface modes can be selected: three-wire serial I/O mode or two-wire serial I/O
mode.
Whether three-wire serial I/O mode or two-wire serial I/O mode is selected depends on the input level of the SEL
pin (pin 12). (See
Section 3.3
for details.)
SEL
←
1: Three-wire serial I/O
SEL
←
0: Two-wire serial I/O
(1) Three-wire serial I/O (SEL
←
1)
Three wires are used to read and write data. The three wires are the serial clock input (SCK), serial data input
(SI
Note 1
), and serial data output (SO
Note 2
).
(a) Read operation
Data is output to the SO pin upon detecting the falling edge of the SCK pin.
(b) Write operation
Data is input via the SI pin upon detecting the rising edge of the SCK pin. At this time, 1 is output on the
SO pin.
(2) Two-wire serial I/O (SEL
←
0)
Two wires are used to read and write data. The two wires are the serial clock input (SCK) and serial data I/O
(SIO
Note 1
).
(a) Read operation
The SIO pin is placed in the output state, and data is output upon detecting the falling edge of the SCK pin.
(b) Write operation
The SIO pin is placed in the input state, and data is input upon detecting the rising edge of the SCK pin.
Notes 1.
The SI pin for three-wire serial I/O mode is also used as the SIO pin for two-wire serial I/O mode.
2.
The impedance of the SO pin for three-wire serial I/O mode goes high in two-wire serial I/O mode. So,
connect the SO pin to GND or V
DD
.
相關(guān)PDF資料
PDF描述
UPD72042A LSI DEVICES FOR Inter Equipment BusTM (IEBusTM) PROTOCOL CONTROL
UPD72042AGT LSI DEVICES FOR Inter Equipment BusTM (IEBusTM) PROTOCOL CONTROL
UPD72042B LSI DEVICES FOR Inter Equipment BusTM (IEBusTM) PROTOCOL CONTROL
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UPD72042BGT-A 制造商:Renesas Electronics 功能描述:LSI Device 16-Pin SOP 制造商:Renesas Electronics 功能描述:LSI Device 16-Pin SOP Cut Tape
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