Monitor ROM (MON)
Functional Description
MC68HC908AB32
—
Rev. 1.0
Technical Data
MOTOROLA
Monitor ROM (MON)
161
is a summary of the differences between user mode and
monitor mode.
10.4.2 Data Format
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.
Figure 10-2. Monitor Data Format
Figure 10-3. Sample Monitor Waveforms
Table 10-2. Mode Differences
Modes
Functions
COP
Reset
Vector
High
Reset
Vector
Low
Break
Vector
High
Break
Vector
Low
SWI
Vector
High
SWI
Vector
Low
User
Enabled
$FFFE
$FFFF
$FFFC
$FFFD
$FFFC
$FFFD
Monitor
Disabled
(1)
Notes:
1. If the high voltage (V
TST
) is removed from the IRQ pin while in monitor mode, the SIM
asserts its COP enable output. The COP can be enabled or disabled by the COPD bit in
the configuration register 1 (CONFIG1). (See
23.6 5.0-V DC Electrical Characteristics
$FEFE
$FEFF
$FEFC
$FEFD
$FEFC
$FEFD
BIT 5
START
BIT
BIT 0
BIT 1
NEXT
STOP
BIT
START
BIT
BIT 2
BIT 3
BIT 4
BIT 6
BIT 7
BIT 5
START
BIT
BIT 0
BIT 1
NEXT
STOP
BIT
START
BIT
BIT 2
BIT 3
BIT 4
BIT 6
BIT 7
START
BIT
BIT 0
BIT 1
STOP
BIT
BIT 2
$A5
BREAK
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
Содержание MC68HC908AB32
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