mc68hc908gr16 Freescale Semiconductor, Inc, mc68hc908gr16 Datasheet - Page 246

• Manufacturer Part Number: mc68hc908gr16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Function
[Pin No.]
MON08
Normal
Monitor
Monitor
Forced
1. PTA0 must have a pullup resistor to V
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.
3. External clock is an 32.768 kHz crystal on OSC1 and OSC2 or a 32.768 kHz, 4.9152 MHz, or 9.8304 MHz canned oscillator on OSC1.
4. X = don’t care
5. MON08 pin refers to P&E Microcomputer Systems’ MON08-Cyclone 2 by 8-pin connector.
Mode
User
—
GND
GND
GND
V
V
V
IRQ
V
V
V
[6]
TST
TST
or
or
TST
X
DD
DD
DD
OSC1
GND
V
V
V
V
RST
RST
V
V
V
V
V
V
[5]
V
or
TST
or
TST
or
TST
or
TST
DD
DD
DD
DD
DD
DD
NC
NC
NC
NC
NC
NC
DD
Vector
(blank)
(blank)
(blank)
Reset
$FF
$FF
$FF
$FF
Not
—
11
13
15
X
X
X
1
3
5
7
9
Communication
PTA0
COM
12
16
[8]
10
14
Table 19-1. Monitor Mode Signal Requirements and Options
X
X
X
1
1
1
1
2
4
6
8
Serial
DD
GND
RST
IRQ
PTA0
PTA1
PTB0
PTB1
PTB4
PTA1
SSEL
in monitor mode.
[10]
X
0
0
0
0
X
X
MOD0
PTB0
[12]
Selection
X
X
X
X
X
1
1
Mode
MOD1
PTB1
[14]
X
X
X
X
X
0
0
Divider
PTB4
DIV4
[16]
X
0
1
X
X
X
X
OFF Disabled
OFF Disabled
OFF Disabled
OFF Enabled
PLL
ON Disabled
—
X
X
Enabled
COP
—
X
External
16 MHz
4.9152
9.8304
32.768
Clock
OSC1
MHz
MHz
kHz
[13]
X
X
X
Communication
Frequency
Speed
2.4576
2.4576
2.4576
4 MHz
MHz
MHz
MHz
Bus
—
X
X
X
Baud
Rate
9600
9600
9600
9600
—
X
X
X
Reset condition
User mode —
illegal address reset
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