參數(shù)資料
型號(hào): M37534E8SP
廠(chǎng)商: Renesas Technology Corp.
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): 25/55頁(yè)
文件大?。?/td> 610K
代理商: M37534E8SP
7534 Group
Rev.2.00
Jun 21, 2004
page 31 of 54
REJ03B0099-0200Z
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. Refer to Figure 34.
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.
Fig. 34 Serial I/O2 timing (LSB first)
D0
Note : When the internal clock is selected as the transfer and the direction register of P1 3/SDATA pin is set to the input mode,
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
the SDATA pin is in a high impedance state after the data transfer is completed.
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