438
CHAPTER 19 SERIAL INTERFACE CHANNEL 1
In 6-byte transmission/reception (ARLD = 0, RE = 1) in basic transmit/receive mode, buffer RAM operates as
follows.
(i)
Before transmission/reception (refer to Figure 19-10 (a))
After any data has been written to the 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 receive data 1 (R1) is transferred from SIO1 to the buffer RAM,
and 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/reception point (refer to Figure 19-10 (b))
Transmission/reception 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, the receive data 4 (R4)
is transferred from SIO1 to the buffer RAM, and ADTP is decremented.
(iii) Completion of transmission/reception (refer to Figure 19-10 (c))
When transmission of the sixth byte is completed, the receive data 6 (R6) is transferred from SIO1
to the buffer RAM, and the interrupt request flag (CSIIF1) is set (INTCSI1 generation).
Figure 19-10. Buffer RAM Operation in 6-byte Transmission/Reception
(in Basic Transmit/Receive Mode) (1/2)
(a) Before transmission/reception
Transmit data 1 (T1)
Transmit data 2 (T2)
Transmit data 3 (T3)
Transmit data 4 (T4)
Transmit data 5 (T5)
Transmit data 6 (T6)
FADFH
FAC5H
FAC0H
Receive data 1 (R1)
SIO1
0
CSIIF1
5
ADTP
–1
Summary of Contents for PD78076
Page 2: ...2 MEMO ...
Page 12: ...12 MEMO ...
Page 48: ...48 MEMO ...
Page 64: ...64 MEMO ...
Page 82: ...82 MEMO ...
Page 100: ...100 MEMO ...
Page 130: ...130 MEMO ...
Page 180: ...180 MEMO ...
Page 222: ...222 MEMO ...
Page 248: ...248 MEMO ...
Page 288: ...288 MEMO ...
Page 308: ...308 MEMO ...
Page 364: ...364 MEMO ...
Page 494: ...494 MEMO ...
Page 526: ...526 MEMO ...
Page 544: ...544 MEMO ...
Page 558: ...558 MEMO ...
Page 580: ...580 MEMO ...
Page 596: ...596 MEMO ...
Page 598: ...598 MEMO ...
Page 626: ...626 MEMO ...