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MC68HC908LB8_05 Datasheet, PDF (213/234 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers
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Table 19-1. Monitor Mode Signal Requirements and Options
Mode
IRQ RST
(PTC2) (PTA5)
Reset
Vector
Serial
Communication
PTA0
Mode
Selection
PTA1 PTA4
COP
Communication
Speed
External
Bus
Clock Frequency
Baud
Rate
Comments
—
X
GND
X
X
X
X
X
X
X
X Reset condition
Normal
Monitor
VTST
VDD
X
1
1
0
Disabled 9.8304 MHz 2.4576 MHz
9600
Provide external clock
at OSC1
Forced
VDD
VDD
$FF
(blank)
1
Monitor
GND
VDD
$FF
(blank)
1
X
X
Disabled 9.8304 MHz 2.4576 MHz
9600
Provide external clock
at OSC1
X
X Disabled
X
4 MHz
9600 Internal clock is active
User
VDD
or
VDD
Not
$FF
X
GND
X
X Enabled
X
X
X
MON08
Function
[Pin No.]
VTST
[6]
RST
[4]
—
COM
[8]
MOD0 MOD1
[12] [10]
—
OSC1
[13]
—
—
1. PTA0 must have a pullup resistor to VDD in monitor mode.
2. Communication speed in the table is an example to obtain a baud rate of 9600. Baud rate using external oscillator is bus frequency / 256 and
baud rate using internal oscillator is bus frequency / 417.
3. External clock is an 9.8304 MHz on OSC1.
4. X = don’t care
5. MON08 pin refers to P&E Microcomputer Systems’ MON08-Cyclone 2 by 8-pin connector.
NC 1
NC 3
NC 5
NC 7
NC 9
NC 11
OSC1 13
VDD 15
2 GND
4 RST
6 IRQ
8 PTA0
10 PTA4
12 PTA1
14 NC
16 NC
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