參數(shù)資料
型號: M37531RSS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 8 MHz, MICROCONTROLLER, CDIP42
封裝: SHRINK, CERAMIC, PIGGY BACK, DIP-42
文件頁數(shù): 18/76頁
文件大小: 1022K
代理商: M37531RSS
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
7531 Group
MITSUBISHI MICROCOMPUTERS
25
Serial I/O2 operation
By writing to the serial I/O2 register (address 003116) the serial I/O2
counter is set to “7”.
After writing, the SDATA pin outputs data every time the transfer clock
shifts from a high to a low level. And, as the transfer clock shifts from
a low to a high, the SDATA pin reads data, and at the same time the
contents of the serial I/O2 register are shifted by 1 bit.
When the internal clock is selected as the transfer clock source, the
following operations execute as the transfer clock counts up to 8.
Serial I/O2 counter is cleared to “0”.
Transfer clock stops at an “H” level.
Interrupt request bit is set.
Shift completion flag is set.
Also, the SDATA pin is in a high impedance state after the data trans-
fer is complete.
When the external clock is selected as the transfer clock source, the
interrupt request bit is set as the transfer clock counts up to 8, but
external control of the clock is required since it does not stop. Notice
that the SDATA pin is not in a high impedance state on the completion
of data transfer.
D0
: When the internal clock is selected as the transfer, the S DATA pin is in a high impedance state after the data transfer is completed.
Note
Synchronous clock
Serial I/O2 register
write signal
Transfer clock
(Note)
SDATA at serial I/O2
input receive
SDATA at serial I/O2
output transmit
Serial I/O2 interrupt request bit set
D1
D2
D3
D4
D5
D6
D7
Fig. 29 Serial I/O2 timing (LSB first)
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