MC68HC705V12CFN MOTOROLA [Motorola, Inc], MC68HC705V12CFN Datasheet - Page 182
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MC68HC705V12CFN
Manufacturer Part Number
MC68HC705V12CFN
Description
The Motorola microcontroller
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC705V12CFN.pdf
(248 pages)
- Current page: 182 of 248
- Download datasheet (2Mb)
Byte Data Link Controller – Digital (BDLC–D)
14.8 Low-Power Modes
14.8.1 Wait Mode
14.8.2 Stop Mode
Advance Information
182
NOTE:
NOTE:
halted is after at least one byte plus two extra logic 1s have been
transmitted. The receiver will pick this up as an error and relay it in the
state vector register as an invalid symbol error.
The extra logic 1s are an enhancement to the J1850 protocol which
forces a byte boundary condition fault. This is helpful in preventing noise
on the J1850 bus from corrupting a message.
The following information concerns wait mode and stop mode.
This power-conserving mode is entered automatically from run mode
whenever the CPU executes a WAIT instruction and the WCM bit in
BDLC control register 1 (BCR1) is previously clear. In BDLC wait mode,
the BDLC cannot drive any data.
A subsequent successfully received message, including one that is in
progress at the time that this mode is entered, will cause the BDLC to
wake up and generate a CPU interrupt request if the interrupt enable (IE)
bit in the BDLC control register 1 (BCR1) is previously set (see
BDLC Control Register 1
in less of a power savings, but the BDLC is guaranteed to receive
correctly the message which woke it up, since the BDLC internal
operating clocks are kept running.
Ensuring that all transmissions are complete or aborted before putting
the BDLC into wait mode is important.
This power-conserving mode is entered automatically from run mode
whenever the CPU executes a STOP instruction or if the CPU executes
a WAIT instruction and the WCM bit in the BDLC control register 1
(BCR1) is previously set. This is the lowest power mode that the BDLC
can enter.
Byte Data Link Controller – Digital (BDLC–D)
for a better understanding of IE). This results
MC68HC705V12
MOTOROLA
—
14.7.2
Rev. 3.0
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