mc68hc912dg128 Freescale Semiconductor, Inc, mc68hc912dg128 Datasheet - Page 343

• Manufacturer Part Number: mc68hc912dg128
• Description: M68hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

17.13.6 msCAN12 Receiver Flag Register (CRFLG)
MC68HC912DG128 — Rev 3.0
MOTOROLA
CRFLG
$0104
RESET
W
R
NOTE:
WUPIF
Bit 7
0
The bit time is determined by the oscillator frequency, the baud rate
prescaler, and the number of time quanta (Tq) clock cycles per bit (as
shown above).
The CBTR1 register can only be written if the SFTRES bit in CMCR0 is
set.
All bits of this register are read and clear only. A flag can be cleared by
writing a 1 to the corresponding bit position. A flag can only be cleared
when the condition which caused the setting is no more valid. Writing a
0 has no effect on the flag setting. Every flag has an associated interrupt
enable flag in the CRIER register. A hard or soft reset clears the register.
WUPIF — Wake-up Interrupt Flag
RWRNIF — Receiver Warning Interrupt Flag
1. Condition to set the flag: RWRNIF = (96 < REC
RWRNIF
Freescale Semiconductor, Inc.
If the msCAN12 detects bus activity while in SLEEP Mode, it sets the
WUPIFflag. If not masked, a Wake-Up interrupt is pending while this
flag is set.
This flag is set when the msCAN12 goes into warning status due to
the Receive Error counter (REC) exceeding 96 and neither one of the
Error interrupt flags or the Bus-Off interrupt flag is set
masked, an Error interrupt is pending while this flag is set.
6
0
For More Information On This Product,
0 = No wake-up activity has been observed while in SLEEP Mode.
1 = msCAN12 has detected activity on the bus and requested
0 = No receiver warning status has been reached.
1 = msCAN12 went into receiver warning status.
wake-up.
BitTime
TWRNIF
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5
0
MSCAN Controller
=
------------------------------------------ - number
f CGMCANCLK
Presc value
RERRIF
4
0
TERRIF
3
0
Programmer’s Model of Control Registers
127) & RERRIF& TERRIF & BOFFIF
BOFFIF
Þ
2
0
of
Þ
TimeQuanta
OVRIF
1
0
MSCAN Controller
(1)
. If not
Technical Data
Bit 0
RXF
0
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