CHAPTER 14 SERIAL INTERFACE CHANNEL 1
285
User’s Manual U11302EJ4V0UM
In 6-byte transmission (ARLD = 0, RE = 0) in basic transmission mode, buffer RAM operates as
follows.
(i)
Before transmission
(refer to
Figure 14-13 (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) 4th byte transmission point
(refer to
Figure 14-13 (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 14-13 (c)
)
When transmission of the sixth byte is completed, the interrupt request flag (CSIIF1) is set
(INTCSI1 generation).
Figure 14-13. Buffer RAM Operation in 6-Byte Transmission (in Basic 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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