Serial Communication Interface (S12SCIV5)
11.3.2.3 SCI Alternative Status Register 1 (SCIASR1)
Module Base + 0x0000
7
6
5
4
3
2
1
0
R
W
0
0
0
0
BERRV
RXEDGIF
BERRIF
BKDIF
Reset
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 11-6. SCI Alternative Status Register 1 (SCIASR1)
Read: Anytime, if AMAP = 1
Write: Anytime, if AMAP = 1
Table 11-6. SCIASR1 Field Descriptions
Description
Field
7
Receive Input Active Edge Interrupt Flag — RXEDGIF is asserted, if an active edge (falling if RXPOL = 0,
RXEDGIF rising if RXPOL = 1) on the RXD input occurs. RXEDGIF bit is cleared by writing a “1” to it.
0 No active receive on the receive input has occurred
1 An active edge on the receive input has occurred
2
Bit Error Value — BERRV reflects the state of the RXD input when the bit error detect circuitry is enabled and
a mismatch to the expected value happened. The value is only meaningful, if BERRIF = 1.
0 A low input was sampled, when a high was expected
BERRV
1 A high input reassembled, when a low was expected
1
Bit Error Interrupt Flag — BERRIF is asserted, when the bit error detect circuitry is enabled and if the value
sampled at the RXD input does not match the transmitted value. If the BERRIE interrupt enable bit is set an
interrupt will be generated. The BERRIF bit is cleared by writing a “1” to it.
0 No mismatch detected
BERRIF
1 A mismatch has occurred
0
Break Detect Interrupt Flag — BKDIF is asserted, if the break detect circuitry is enabled and a break signal is
BKDIF
received. If the BKDIE interrupt enable bit is set an interrupt will be generated. The BKDIF bit is cleared by writing
a “1” to it.
0 No break signal was received
1 A break signal was received
11.3.2.4 SCI Alternative Control Register 1 (SCIACR1)
Module Base + 0x0001
7
6
5
4
3
2
1
0
R
W
0
0
0
0
0
RXEDGIE
BERRIE
BKDIE
Reset
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 11-7. SCI Alternative Control Register 1 (SCIACR1)
Read: Anytime, if AMAP = 1
Write: Anytime, if AMAP = 1
S12P-Family Reference Manual, Rev. 1.13
370
Freescale Semiconductor
FREESCALE [ Freescale ]
