mc68hc908gr8b Freescale Semiconductor, Inc, mc68hc908gr8b Datasheet - Page 222

• Manufacturer Part Number: mc68hc908gr8b
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Development Support
222
Function
[Pin No.]
MON08
Monitor
Monitor
Normal
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.
3. External clock is an 9.8304 MHz crystal on OSC1 and OSC2 or a 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
Baud rate using external oscillator is bus frequency / 256.
V
V
V
V
IRQ
V
[6]
TST
or
TST
DD
DD
SS
V
V
RST
RST
V
V
V
[4]
or
TST
or
TST
DD
DD
DD
Table 18-1. Monitor Mode Signal Requirements and Options
Vector
$FFFF
(blank)
$FFFF
Reset
Not
—
X
PTA0
COM
[8]
Communi-
X
1
1
cation
Serial
MC68HC908GR8B Data Sheet, Rev. 3.0
DD
in monitor mode.
PTA1
SSEL
OSC1
[10]
X
0
0
V
NC
NC
NC
NC
NC
NC
DD
MOD0
PTB0
[12]
11
13
15
X
X
1
1
3
5
7
9
Selection
Mode
MOD1
PTB1
[14]
10
12
14
16
X
X
0
2
4
6
8
GND
RST
IRQ
PTA0
PTA1
PTB0
PTB1
NC
OFF
OFF
PLL
—
X
Disabled
Disabled
Enabled
COP
—
External
9.8304
9.8304
Clock
OSC1
MHz
MHz
[13]
X
Communication
Freescale Semiconductor
Frequency
Speed
2.4576
2.4576
MHz
MHz
Bus
—
X
Baud
Rate
9600
9600
—
X