MC68HC08AB16A Datasheet, PDF (153/380 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Monitor ROM (MON)
Functional Description
Table 10-2 is a summary of the differences between user mode and
monitor mode.
Table 10-2. Mode Differences
Functions
Modes
COP
Reset Reset Break Break SWI
SWI
Vector Vector Vector Vector Vector Vector
High Low High Low High Low
User
Enabled $FFFE $FFFF $FFFC $FFFD $FFFC $FFFD
Monitor _Disabled⁽¹⁾ $FEFE $FEFF $FEFC $FEFD $FEFC $FEFD
Notes:
1. If the high voltage (V_TST) is removed from the IRQ pin while in monitor mode, the SIM as-
serts 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.)
10.4.2 Data Format
Communication with the monitor ROM is in standard non-return-to-zero
(NRZ) mark/space data format. (See Figure 10-2 and Figure 10-3.)
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.
NEXT
START
START
BIT BIT 0 BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 ^STOP BIT
BIT
Figure 10-2. Monitor Data Format
NEXT
START
START
$A5 _BIT BIT 0 BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 STOP BIT
BIT
START
STOP
BREAK _BIT BIT 0 BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 BIT
Figure 10-3. Sample Monitor Waveforms
MC68HC08AB16A — Rev. 2.0
MOTOROLA
Monitor ROM (MON)
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Technical Data
153