mc68hc908rf2 Freescale Semiconductor, Inc, mc68hc908rf2 Datasheet - Page 169

• Manufacturer Part Number: mc68hc908rf2
• Description: M68hc08 Microcontrollers Microcontroller / Transmitter
• Manufacturer: Freescale Semiconductor, Inc

13.3.1.6 Baud Rate
13.3.2 Security
MC68HC908RF2 — Rev. 4.0
MOTOROLA
NOTE:
NOTE:
The MCU executes the SWI and PSHH instructions when it enters monitor mode.
The RUN command tells the MCU to execute the PULH and RTI instructions.
Before sending the RUN command, the host can modify the stacked CPU registers
to prepare to run the host program. The READSP command returns the
incremented stack pointer value, SP + 1. The high and low bytes of the program
counter are at addresses SP + 5 and SP + 6.
With a 9.8304-MHz crystal, data is transferred between the monitor and host at
9600 baud. If a 14.7456-MHz crystal is used, the monitor baud rate is 14400.
While in monitor mode with V
driven from the external clock.
A security feature discourages unauthorized reading of FLASH locations while in
monitor mode. The host can bypass the security feature at monitor mode entry by
sending eight consecutive security bytes that match the bytes at locations
$FFF6–$FFFD. Locations $FFF6–$FFFD contain user-defined data.
Do not leave locations $FFF6–$FFFD blank. For security reasons, program
locations $FFF6–$FFFD even if they are not used for vectors. If FLASH is
unprogrammed, the eight security byte values to be sent are $00, the
unprogrammed state of the FLASH.
During monitor mode entry, the MCU waits after the power-on reset for the host to
send the eight security bytes on pin PA0.
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 13-12. Stack Pointer at Monitor Mode Entry
Go to: www.freescale.com
Development Support
HIGH BYTE OF PROGRAM COUNTER
LOW BYTE OF PROGRAM COUNTER
HIGH BYTE OF INDEX REGISTER
LOW BYTE OF INDEX REGISTER
CONDITION CODE REGISTER
HI
applied to IRQ1, the MCU bus clock is always
ACCUMULATOR
SP
SP + 1
SP + 2
SP + 3
SP + 4
SP + 5
SP + 6
SP + 7
Development Support
Monitor Module
Data Sheet
169