參數(shù)資料
型號(hào): M38B79MFH-A157FP
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述: 單芯片8位CMOS微機(jī)
文件頁(yè)數(shù): 41/109頁(yè)
文件大小: 1559K
代理商: M38B79MFH-A157FP
38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
PRELIMINARY
Notice: This is not a final specification.
change.
Some parametric limits are subject to
41
Serial I/O3
The serial I/O3 function can be used only for 8-bit clock synchro-
nous serial I/O.
All serial I/O pins are shared with port P9, which can be set with
the serial I/O3 control register (address 0EEC
16
).
[Serial I/O3 Control Register (SIO3CON)] 0EEC
16
The serial I/O3 control register contains eight bits which control
various serial I/O functions.
G
Serial I/O3 Operation
Either the internal clock or external clock can be selected as syn-
chronous clock for serial I/O3 transfer.
The internal clock can use a built-in dedicated divider where 6 dif-
ferent clocks are selected. In the case of the internal clock used,
transfer is started by a write signal to the serial I/O3 register (ad-
dress 0EED
16
). When 8-bit data has been transferred, the S
OUT3
pin goes to high impedance state.
In the case of the external clock used, the clock must be externally
controlled. It is because the contents of serial I/O3 register is kept
shifted while the clock is being input. Additionally, the function to
put the S
OUT3
pin high impedance state at completion of data
transfer is not available.
The serial I/O3 interrupt request bit is set at completion of 8-bit
data transfer, regardless of use of the internal clock or external
clock.
Fig. 42 Structure of serial I/O3 control register
Fig. 41 Block diagram of serial I/O3
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