Motorola MC68HC908AB32 User Manual

Monitor ROM (MON)
Functional Description
MC68HC908AB32 — Rev. 1.0 Technical Data
MOTOROLA Monitor ROM (MON) 161
Table 10-2 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 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.
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

Motorola MC68HC908AB32 Specifications

General

Brand	Motorola
Model	MC68HC908AB32
Category	Controller
Language	English