MC68HC08AZ32A Datasheet, PDF (159/456 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Monitor ROM (MON)
Functional description
Table 11-2 is a summary of the differences between user mode and
monitor mode.
Table 11-2. Mode Differences
Functions
Modes
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⁾ $FEFE $FEFF $FEFC $FEFD $FEFC $FEFD
1. If the high voltage (V_HI) is removed from the IRQ and/or RESET pin while in monitor mode, the SIM as-
serts its COP enable output. The COP is enabled or disabled by the COPD bit in the configuration reg-
ister. See 5.0 Volt DC Electrical Characteristics on page 426.
11.4.2 Data Format
Communication with the monitor ROM is in standard non-return-to-zero
(NRZ) mark/space data format. (See Figure 11-2 and Figure 11-3).
START
BIT BIT 0
BIT 1
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
STOP
BIT
NEXT
START
BIT
Figure 11-2. Monitor Data Format
$A5
BREAK
START
BIT BIT 0
START
BIT BIT 0
BIT 1
BIT 1
BIT 2
BIT 2
BIT 3
BIT 3
BIT 4
BIT 4
BIT 5
BIT 5
BIT 6
BIT 6
BIT 7
BIT 7
STOP
BIT
STOP
BIT
NEXT
START
BIT
NEXT
START
BIT
Figure 11-3. Sample Monitor Waveforms
The data transmit and receive rate can be anywhere up to 28.8 KBaud.
Transmit and receive baud rates must be identical.
MC68HC08AZ32A — Rev 1.0
MOTOROLA
Monitor ROM (MON)
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Technical Data
159