MC908AP32CFBE Freescale, MC908AP32CFBE Datasheet - Page 119
MC908AP32CFBE
Manufacturer Part Number
MC908AP32CFBE
Description
Manufacturer
Freescale
Datasheet
1.MC908AP32CFBE.pdf
(324 pages)
Specifications of MC908AP32CFBE
Cpu Family
HC08
Device Core Size
8b
Frequency (max)
8MHz
Interface Type
SCI/SPI
Total Internal Ram Size
2KB
# I/os (max)
32
Number Of Timers - General Purpose
4
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
2.7V
On-chip Adc
8-chx10-bit
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
44
Package Type
PQFP
Program Memory Type
Flash
Program Memory Size
32KB
Lead Free Status / RoHS Status
Compliant
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Enter monitor mode with pin configuration shown in
rising edge of RST latches monitor mode. Once monitor mode is latched, the values on the specified pins
can change.
Once out of reset, the MCU waits for the host to send eight security bytes. (See
security bytes, the MCU sends a break signal (10 consecutive logic 0’s) to the host, indicating that it is
ready to receive a command.
In monitor mode, the MCU uses different vectors for reset, SWI (software interrupt), and break interrupt
than those for user mode. The alternate vectors are in the $FE page instead of the $FF page and allow
code execution from the internal monitor firmware instead of user code.
Table 8-2
Freescale Semiconductor
summarizes the differences between user mode and monitor mode vectors.
Exiting monitor mode after it has been initiated by having a blank reset
vector requires a power-on reset (POR). Pulling RST low will not exit
monitor mode in this situation.
Monitor
Modes
User
Figure 8-2. Low-Voltage Monitor Mode Entry Flowchart
Table 8-2. Mode Differences (Vectors)
Vector
$FFFE
$FEFE
Reset
High
MC68HC908AP Family Data Sheet, Rev. 4
MONITOR MODE
TRIGGERED?
POR RESET
IS VECTOR
EXECUTE
MONITOR
BLANK?
CODE
Vector
POR
$FFFF
$FEFF
Reset
Low
YES
YES
NOTE
NO
Figure 8-1
NO
$FEFC
Vector
$FFFC
Break
High
Functions
NORMAL USER
Vector
$FFFD
$FEFD
Break
by pulling RST low and then high. The
Low
MODE
$FEFC
Vector
$FFFC
High
SWI
8.4
Vector
$FFFD
$FEFD
Functional Description
Security.) After the
Low
SWI
119
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