M68ICS08KX Freescale Semiconductor, M68ICS08KX Datasheet - Page 35

• Manufacturer Part Number: M68ICS08KX
• Description: SIM PROGRAM FOR 68HC908KX8/KX2
• Manufacturer: Freescale Semiconductor
• Type: Simulator/Programmerr

Specifications of M68ICS08KX

• Contents: Programmer, Power Supply, Assembler/Simulator/Debugger, Cable, Software and Documentation
• For Use With/related Products: 68HC908KX8/KX2
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

3.4.4 Start-Up in Monitor Mode
M68ICS08KX In-Circuit Simulator
MOTOROLA
When the jumper is set for the PTB6 position, the MCU runs from it’s internal
clock and pin PTB6 of the MCU is connected to the target connector.
When the jumper is set for the CLK position, the Y1 external clock signal from
the KXICS board is applied to the PTB6 pin of the MCU for timing. (An internal
MCU register must be set to control the selection of internal or external clock.)
The external clock, Y1, has an output frequency of 9.8304 MHz to allow the
MCU to communicate at 9600 baud. It is socketed to allow the use of a full-size
or half-size clock. You may change clock frequencies by installing a new clock
chip, however the serial communication rate proportionally changes. W3 may
be used to disable the external clock.
Additionally, the on-board clock is available as an output on the 3-pin header J4
for target or computer host clock synchronization.
Following power up the ICS_RST# is held low for a period of time by U8.
When ICS_RST* is asserted high, the binary ripple counter, U3, counts up 1024
clock cycles prior to allowing DELAY RESET to be asserted. The delayed reset
controls the analog switch, U7, connected to PTA1 and PTB[0...1]. The RTS
signal is held high which places the V
Analog switch, U7, connects PTA1 to common, PTB0 to V
to common until DELAY_RESET is asserted. V
+3Vdc during the reset release forcing the KXICS board to power up in the
Monitor Mode.
Following the counter time-out, the analog switch, U7, is toggled so that the
PTA1 and PTB[0...1] pins of the board are connected to the target head
connectors.
Following entry into monitor mode, you may switch the IRQ* voltage to
V
connection of MCU pin 9 from the ICS reset circuitry to a connection to the
target head connector. Be aware that beside disabling the use of external resets
of the MCU, internal MCU features, e.g., the COP must be serviced properly in
this mode.
DD_MCU
by setting RTS low. The analog switch, U14, will switch the
Support Information
TST
voltage as the high voltage for IRQ*.
TST
is held above V
KXICS Theory of Operation
DD_MCU
Support Information
User’s Manual
, and PTB1
DD-MCU
35