參數資料
型號: UPD72042BGT
廠商: NEC Corp.
英文描述: LSI DEVICES FOR Inter Equipment BusTM (IEBusTM) PROTOCOL CONTROL
中文描述: LSI器件間設備BusTM(IEBusTM)協議控制
文件頁數: 27/92頁
文件大小: 541K
代理商: UPD72042BGT
μ
PD72042A, 72042B
27
DATA SHEET S13990EJ2V0DS00
(2) Data read mode
(a)
μ
PD72042A (starting with MSB)
C/D
SCK
SIO
Note
A3
A2
A1
A0
×
×
×
D7
D6
D5
D4
D3
D2
D1
D0
1
Serial clock counter
reset pointer
State
Control mode
(selection of register read)
Data read mode
(b)
μ
PD72042B (starting with LSB)
C/D
SCK
SIO
Note
A0
A1
A2
D0
D1
D2
D3
D4
D5
D6
D7
1
×
×
×
A3
Serial clock counter
reset pointer
Control mode
(selection of register read)
Data read mode
State
Note
SIO pin input state
SIO pin output state
Cautions 1. When the C/D pin is set high in data read mode, the serial clock counter is reset. Therefore,
the remaining bits of the byte cannot be read; at the next falling edge, a read operation is
performed starting from the next byte in the case of RBF, or from the first bit for other registers.
2. The SIO pin is a CMOS I/O pin. So, be careful to avoid an output collision between the SIO
pin and the microcomputer. Further, a pull-up resistor is required when N-ch open-drain
output of the microcomputer is used. Note that if the last output level is low upon the
termination of read mode, current will flow constantly.
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UPD72042A LSI DEVICES FOR Inter Equipment BusTM (IEBusTM) PROTOCOL CONTROL
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