Freescale Semiconductor M68HC08 series, Руководство по проектированию, Страница: 32 / 124

Hardware Description
Designer Reference Manual DRM047 — Rev 0
32 Hardware Description MOTOROLA
3.2.3 Software Download and Debugging
Connector J2 is used for software download or debugging. This is based
on so called MON08 mode (see
Section 9. References , 10 , Section 10
Monitor ROM)
The signals PTB4/AD4, PTB3/AD3, PTA1/KB1, PTA0/KB0, IRQ_IN
must be set according to
Table 3-1 to put the MCU into MON08 mode
for software download or debugging (see Section 9. References , 10 ).
RST is the MCU reset pin. The MON08 mode must be timed with
external clock - PTC4/OSC.
There must be 9V for debugging on the IRQ_IN pin. Therefore the
jumper JP1 must be open. In user (standard operational) mode the
IRQ_IN must be attached to the IRQ_OUT from the Power Die module.
This is used for some operations like wake-up condition, where the
Power Die module. Therefore JP1 must be closed for user (standard
operational) mode.
Pin1 PTC4/OSC is precise clock input for MON08 mode. There must be
external clock source for the software download and debugging.
Table 3-1. Connector J2 Signals
Pin No
Input/
Output
Pin Name Description MON08 mode
1 PTC4/OSC 19,6608kHz
2 VSS Ground GND
3 VDD 5V supply 5V
4 In IRQ_IN MCU IRQ Input 9V
5 Out IRQ_RQ
Power Die IRQ
output
jumper JP1 open
6 In RST MCU Reset input falling edge
7 In/Out
PTA0/KB0
MON08 mode
serial
communication
19.200 kBaud
8 In
PTA1/KB1
MON08 mode GND
9 In
PTB3/AD3
MON08 mode GND
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Freescale Semiconductor, Inc.
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