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M16C/62P Group (M16C/62P, M16C/62PT)
17. Serial Interface
Rev.2.41
Jan 10, 2006
Page 221 of 390
REJ09B0185-0241
Figure 17.33
Bus Collision Detect Function-Related Bits
(2) The ACSE Bit in the UiSMR Register (Auto clear of transmit enable bit)
(1) The ABSCS Bit in the UiSMR Register (Bus collision detect sampling clock select)
If ABSCS=0, bus collision is determined at the rising edge of the transfer clock
Transfer clock
Timer Aj
(3) The SSS Bit in the UiSMR Register (Transmit start condition select)
Transmission enable condition is met
If SSS bit = 1, the serial interface starts sending data at the rising edge
(1)
of RXDi
TXDi
CLKi
TXDi
RXDi
TXDi
RXDi
ST
D0
D1
D2
D3
D4
D5
D6
D7
D8
SP
Trigger signal is applied to the TAjIN pin
If ABSCS=1, bus collision is determined when timer
Aj (one-shot timer mode) underflows.
TXDi
RXDi
ST
D0
D1
D2
D3
D4
D5
D6
D7
D8
SP
ST
D0
D1
D2
D3
D4
D5
D6
D7
D8
SP
ST
D0
D1
D2
D3
D4
D5
D6
D7
D8
SP
(i=0 to 2)
Timer Aj: Timer A3 when UART0; Timer A4 when UART1; Timer A0 when UART2
Transfer clock
IR bit in UiBCNIC
register
(1)
NOTES :
1. BCNIC register when UART2.
If ACSE bit = 1 (automatically
clear when bus collision occurs), the
TE bit is cleared to “0”
(transmission disabled) when the
IR bit in the UiBCNIC register= 1
(unmatching detected).
If SSS bit = 0, the serial interface starts sending data one transfer clock cycle after the transmission enable condition is met.
Transfer clock
(NOTE 2)
NOTES :
1. The falling edge of RXDi when IOPOL=0; the rising edge of RXDi when IOPOL =1.
2. The transmit condition must be met before the falling edge
(1)
of RXD.
This diagram applies to the case where IOPOL=1 (reversed).
TE bit in UiC1
register
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