mc68hc908lj24 Freescale Semiconductor, Inc, mc68hc908lj24 Datasheet - Page 168

• Manufacturer Part Number: mc68hc908lj24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Notes:
V
V
1. PTA0 = 1 if serial communication; PTA0 = 0 if parallel communication
2. External clock is derived by a 32.768 kHz crystal or a 4.9152/9.8304 MHz off-chip oscillator
3. Monitor mode entry by IRQ = V
GND
GND
IRQ
TST
TST
V
V
GND
V
or
X
or
DD
DD
DD
(3)
(3)
GND
V
V
V
V
RST
V
V
V
V
V
or
TST
or
TST
TST
or
TST
DD
DD
DD
DD
DD
Not Blank
Address
"$FFFF"
"$FFFF"
"$FFFF"
$FFFE/
$FFFF
Blank
Blank
Blank
X
X
X
Table 10-1. Monitor Mode Signal Requirements and Options
PTA2
X
X
X
X
X
0
0
TST
, a 4.9152/9.8304 MHz off-chip oscillator must be used. The MCU internal crystal oscillator circuit is bypassed.
PTA1
X
1
1
X
X
X
X
PTA0
X
1
1
1
1
X
X
(1)
PTC1
X
0
1
X
X
X
X
External
Clock
4.9152
9.8304
9.8304
32.768
MHz
MHz
MHz
kHz
X
X
X
(2)
Frequency
2.4576
2.4576
2.4576
2.4576
MHz
MHz
MHz
MHz
Bus
—
—
0
OFF
OFF
OFF
OFF
OFF
PLL
ON
X
Disabled
Disabled
Disabled
Disabled
Disabled
Enabled
Enabled
COP
Baud
Rate
9600
9600
9600
9600
—
—
0
No operation until
reset goes high
PTA1 and PTA2
voltages only
required if
IRQ = V
PTC1 determines
frequency divider
PTA1 and PTA2
voltages only
required if
IRQ = V
PTC1 determines
frequency divider
External frequency
always divided by 4
PLL enabled
(BCS set)
in monitor code
Enters user
mode — will
encounter an illegal
address reset
Enters user mode
Comment
TST
TST
;
;