mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 169

• Manufacturer Part Number: mc68hc908sr12
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Notes:
1. PTA0 = 1 if serial communication; PTA0 = 0 if parallel communication (factory use only)
2. When IRQ1 = V
3. External clock is derived by a crystal or an off-chip oscillator.
IRQ1
V
V
GND
GND
GND
V
V
V
TST
TST
or
X
or
DD
DD
DD
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
TST
"$FFFF"
"$FFFF"
"$FFFF"
$FFFE/
$FFFF
Blank
Blank
Blank
X
X
X
, external clock must be derived by a
Table 10-1. Monitor Mode Signal Requirements and Options
PTA2
X
X
X
X
X
0
0
PTA1
X
X
X
X
X
1
1
PTA0
X
X
X
1
1
1
1
(1)
PTC1
4.9152MHz or 9.8304MHz off-chip oscillator.
X
X
X
X
X
0
1
External
4.9152
MHz
9.8304
MHz
9.8304
MHz
32.768
Clock
kHz
X
X
X
(3)
(2)
(2)
(3)
Frequency
2.4576
2.4576
2.4576
2.4576
MHz
MHz
MHz
MHz
Bus
—
—
0
PLL
OFF
OFF
OFF
OFF
OFF
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
IRQ1 = V
PTC1 determines
frequency divider
PTA1 and PTA2
voltages only
required if
IRQ1 = 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
;
;