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M38B71M1 Datasheet(PDF) 35 Page - Renesas Technology Corp

Part No. M38B71M1
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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Maker  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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M38B71M1 Datasheet(HTML) 35 Page - Renesas Technology Corp

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38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
34
When the internal synchronous clock is selected, in the 8-bit serial
I/O mode and the automatic transfer serial I/O mode (SBUSY1 out-
put function outputs in 1-byte units), the SBUSY1 output goes to “L”
and the SBUSY1 output goes to “H” before 0.5 cycle (transfer clock)
of the timing at which the transfer clock from the SCLK1 output
goes to “L” at a start of transmit/receive operation.
In the automatic transfer serial I/O mode (the SBUSY1 output func-
tion outputs all transfer data), the SBUSY1 output goes to “L” and
the SBUSY1 output goes to “H” when the first transmit data is writ-
ten into the serial I/O1 register (address 001B16).
When the external synchronous clock is selected, the SBUSY1 out-
put goes to “L” and the SBUSY1 output goes to “H” when transmit
data is written into the serial I/O1 register to start a transmit opera-
tion, regardless of the serial I/O transfer mode.
At termination of transmit/receive operation, the SBUSY1 output re-
turns to “H” and the SBUSY1 output returns to “L”, the initial status,
when the serial transfer status flag is set to “0”, regardless of
whether the internal or external synchronous clock is selected.
Furthermore, in the automatic transfer serial I/O mode (SBUSY1
output function outputs in 1-byte units), the SBUSY1 output goes to
“H” and the SBUSY1 output goes to “L” each time 1-byte of receive
data is written into the automatic transfer RAM.
Fig. 29 SBUSY1 output operation
(internal synchronous clock, 8-bit serial I/O)
Fig. 30 SBUSY1 output operation
(external synchronous clock, 8-bit serial I/O)
Fig. 31 SBUSY1 output operation in automatic transfer serial I/O mode
(internal synchronous clock, SBUSY1 output function outputs each 1-byte)
SBUSY1
SCLK1
SOUT1
Serial transfer
status flag
Serial transfer
status flag
SBUSY1
SCLK1
Write to Serial
I/O1 register
SCLK1
SBUSY1
SOUT1
Automatic transfer
interval
Serial transfer
status flag
Automatic transfer RAM
→Serial I/O1 register
Serial I/O1 register
→Automatic transfer RAM


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