CHAPTER 14 SERIAL INTERFACE CHANNEL 1
289
User’s Manual U11302EJ4V0UM
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)
(a) Before transmission
Transmit data 1 (T1)
Transmit data 2 (T2)
Transmit data 3 (T3)
Transmit data 4 (T4)
Transmit data 5 (T5)
Transmit data 6 (T6)
FAFFH
FAC5H
FAC0H
SIO1
0
CSIIF1
5
ADTP
—1
Содержание mPD780208 Subseries
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