Chapter 20 Serial Communication Interface (S12SCIV5)
MC9S12XE-Family Reference Manual , Rev. 1.19
730
Freescale Semiconductor
20.3.2.3
SCI Alternative Status Register 1 (SCIASR1)
Read: Anytime, if AMAP = 1
Write: Anytime, if AMAP = 1
20.3.2.4
SCI Alternative Control Register 1 (SCIACR1)
Read: Anytime, if AMAP = 1
Write: Anytime, if AMAP = 1
Module Base + 0x0000
7
6
5
4
3
2
1
0
R
RXEDGIF
0
0
0
0
BERRV
BERRIF
BKDIF
W
Reset
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 20-6. SCI Alternative Status Register 1 (SCIASR1)
Table 20-6. SCIASR1 Field Descriptions
Field
Description
7
RXEDGIF
Receive Input Active Edge Interrupt Flag
— RXEDGIF is asserted, if an active edge (falling if RXPOL = 0,
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
BERRV
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
1 A high input reassembled, when a low was expected
1
BERRIF
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
1 A mismatch has occurred
0
BKDIF
Break Detect Interrupt Flag
— BKDIF is asserted, if the break detect circuitry is enabled and a break signal is
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
Module Base + 0x0001
7
6
5
4
3
2
1
0
R
RXEDGIE
0
0
0
0
0
BERRIE
BKDIE
W
Reset
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 20-7. SCI Alternative Control Register 1 (SCIACR1)
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
S12XE
products
in
208
MAPBGA
packages