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When data of 6 bytes are transmitted in repeat transmission mode (ARLD = 1, RE = 0), the buffer
RAM operates as follows.
(i) Before transmission (refer to Figure 14-16 (a))
After arbitrary 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, the automatic data transmit/receive address pointer
(ADTP) is decremented. Then transmit data 2 (T2) is transferred from the buffer RAM to SIO1.
(ii) Upon completion of transmission of 6 bytes (refer to Figure 14-16 (b))
When transmission of the sixth byte is completed, the interrupt request flag (CSIIF1) is not set.
The first pointer value is set again to ADTP.
(iii) 7th byte transmission point (refer to Figure 14-16 (c))
Transmit data 1 (T1) is transferred from the buffer RAM to SIO1 again. When transmission of
the first byte is completed, ADTP is decremented. Then transmit data 2 (T2) is transferred from
the buffer RAM to SIO1.
Figure 14-16. Buffer RAM Operation in 6-Byte Transmission (in Repeat Transmission Mode) (1/2)
FAFFH
FAC5H
Transmit data 1 (T1)
Transmit data 2 (T2)
Transmit data 3 (T3)
Transmit data 4 (T4)
Transmit data 5 (T5)
FAC0H
Transmit data 6 (T6)
CHAPTER 14 SERIAL INTERFACE CHANNEL 1
(a) Before transmission
User's Manual U11302EJ4V0UM
SIO1
5
ADTP
—1
0
CSIIF1
289
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