Data Format; Mode Differences - Motorola MC68HC908AB32 Technical Data Manual

10.4.2 Data Format

MC68HC908AB32 Rev. 1.0
—
MOTOROLA
Table 10-2 is a summary of the differences between user mode and
monitor mode.
Modes
COP
User Enabled
(1)
Monitor
Disabled
Notes:
1. If the high voltage (V
asserts its COP enable output. The COP can be enabled or disabled by the COPD bit in
the configuration register 1 (CONFIG1). (See
Communication with the monitor ROM is in standard non-return-to-zero
(NRZ) mark/space data format. (See
The data transmit and receive rate can be anywhere from 4800 baud to
28.8 k-baud. Transmit and receive baud rates must be identical.
START
BIT 0 BIT 1
BIT
Figure 10-2. Monitor Data Format
START
$A5
BIT 0 BIT 1
BIT
START
BREAK
BIT 0 BIT 1
BIT
Figure 10-3. Sample Monitor Waveforms
Monitor ROM (MON)
Table 10-2. Mode Differences
Functions
Reset Reset
Vector Vector Vector
High Low
$FFFE $FFFF $FFFC
$FEFE $FEFF $FEFC
) is removed from the IRQ pin while in monitor mode, the SIM
TST
23.6 5.0-V DC Electrical
Figure 10-2
BIT 2 BIT 3 BIT 4 BIT 5
BIT 2 BIT 3 BIT 4
BIT 2 BIT 3 BIT 4
Monitor ROM (MON)
Functional Description
Break Break SWI
Vector Vector
High Low High
$FFFD $FFFC
$FEFD $FEFC
Characteristics.)
and Figure
STOP
BIT 6 BIT 7
BIT
STOP
BIT 5 BIT 6 BIT 7
BIT
STOP
BIT
BIT 5 BIT 6 BIT 7
SWI
Vector
Low
$FFFD
$FEFD
10-3.)
NEXT
START
BIT
NEXT
START
BIT
Technical Data
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