MC68HC08AZ0 Datasheet, PDF (153/444 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
Monitor ROM (MON)
Functional description
Table 2 is a summary of the differences between user mode and monitor
mode.
Table 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
Monitor
Enabled
Disabled⁽¹⁾
$FFFE
$FEFE
$FFFF
$FEFF
$FFFC
$FEFC
$FFFD
$FEFD
$FFFC
$FEFC
$FFFD
$FEFD
1. If the high voltage (V_HI) is removed from the IRQ/V_PP pin or the RST pin, the SIM asserts its COP enable
output. The COP is a mask option enabled or disabled by the COPD bit in the mask option register. See
5.0 Volt DC Electrical Characteristics on page 400.
Data format
Communication with the monitor ROM is in standard non-return-to-zero
(NRZ) mark/space data format. (See Figure 2 and Figure 3).
START
BIT BIT 0
BIT 1
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
NEXT
START
STOP BIT
BIT
Figure 2. Monitor data format
START
$A5 _BIT BIT 0
START
BREAK _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 3. Sample monitor waveforms
The data transmit and receive rate can be anywhere from 4800 baud to
28.8K baud. Transmit and receive baud rates must be identical.
5-mon
MOTOROLA
Monitor ROM (MON)
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MC68HC08AZ0
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