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In 6-byte transmission (ARLD = 0, RE = 0) in basic transmit mode, buffer RAM operates as follows.
(i)
Before transmission (Refer to Figure 17-12 (a))
After any data has been written to serial I/O shift register 1 (SIO1) (start trigger: this data is not
transferred), transmit data 1 (T1) is transferred from the buffer RAM to SIO1. When transmission of the
first byte is completed, automatic data transmit/receive address pointer (ADTP) is decremented. Then
transmit data 2 (T2) is transferred from the buffer RAM to SIO1.
(ii) 4th byte transmission point (Refer to Figure 17-12 (b))
Transmission of the third byte is completed, and transmit data 4 (T4) is transferred from the buffer RAM
to SIO1. When transmission of the fourth byte is completed, ADTP is decremented.
(iii) Completion of transmission (Refer to Figure 17-12 (c))
When transmission of the sixth byte is completed, the interrupt request flag (CSIIF1) is set (INTCSI1
generation).
Figure 17-12. Buffer RAM Operation in 6-Byte Transmission (in Basic Transmit Mode) (1/2)
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CHAPTER 17 SERIAL INTERFACE CHANNEL 1
(a) Before transmission
FADFH
Transmit data 1 (T1)
FAC5H
Transmit data 2 (T2)
Transmit data 3 (T3)
Transmit data 4 (T4)
Transmit data 5 (T5)
Transmit data 6 (T6)
FAC0H
SIO1
5
ADTP
–1
0
CSIIF1
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