R01UH0136EJ0210 Rev.2.10
Page 527 of 800
Jul 31, 2012
M16C/64A Group
24. Serial Interface SI/O3 and SI/O4
24.3.5
Function for Selecting SOUTi State after Transmission
The SOUTi pin state after transmission can be selected when the SMi6 bit in the SiC register is set to 1
(internal clock). If bits SM26 and SM27 in the S34C2 register are both set to 1 (last bit level retained),
output from the SOUTi pin retains the last bit level after transmission. Figure 24.5 shows SOUT3 Pin
Level after Transmission.
Figure 24.5
SOUT3 Pin Level after Transmission
SOUT3
output
CLK3 output
The above SOUT3 example assumes the following:
The SM32 bit in the S3C register is 0 (SOUT3 output),
The SM33 bit in the S3C register is 1 (SOUT3 output, CLK3 selected),
The SM34 bit in the S3C register is 0 (transmit data output at the falling edge of the transmit/receive
clock and the receive data is input at the rising edge ),
The SM35 bit in the S3C register is 0 (LSB first),
The SM36 bit in the S3C register is 1 (internal clock)
D6
D7
D6
D7
High
Low
High
Low
SI/O internal clock
When SM26 = 0
(high-impedance)
When SM26 = 1
(last bit level retained)
Hi-Z
Содержание M16C/60 Series
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