MC68HC908AP16CFB datasheet(161/440 Pages) MOTOROLA

161 / 440 page

Monitor ROM (MON)

Functional Description

MC68HC908AP Family — Rev. 2.5

Data Sheet

MOTOROLA

161

Table 10-3 lists external frequencies required to achieve a standard

baud rate of 9600 BPS. Other standard baud rates can be accomplished

using proportionally higher or lower frequency generators. If using a

crystal as the clock source, be aware of the upper frequency limit that the

internal clock module can handle.

10.3.5 Commands

The monitor ROM firmware uses these commands:

•

READ (read memory)

•

WRITE (write memory)

•

IREAD (indexed read)

•

IWRITE (indexed write)

•

READSP (read stack pointer)

•

RUN (run user program)

The monitor ROM firmware echoes each received byte back to the PTA0

pin for error checking. An 11-bit delay at the end of each command

allows the host to send a break character to cancel the command. A

delay of two bit times occurs before each echo and before READ,

IREAD, or READSP data is returned. The data returned by a read

command appears after the echo of the last byte of the command.

NOTE:

Wait one bit time after each echo before sending the next byte.

Table 10-3. Monitor Baud Rate Selection

External

Frequency

IRQ1

PTB0

Internal

Frequency

Baud Rate

(BPS)

4.9152 MHz

VTST

2.4576 MHz

9600

9.8304 MHz

VTST

2.4576 MHz

9600

9.8304 MHz

VDD

2.4576 MHz

9600

32.768 kHz

VSS

2.4576 MHz

9600

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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