mc68hc908mr32 Freescale Semiconductor, Inc, mc68hc908mr32 Datasheet - Page 258

• Manufacturer Part Number: mc68hc908mr32
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

V
V
GND
GND
IRQ
V
V
V
1. External clock is derived by a 32.768 kHz crystal or a 4.9152/9.8304 MHz off-chip oscillator.
2. DNA = does not apply, X = don’t care
3. PAT0 = 1 if serial communication; PTA0 = X if parallel communication
4. PTA7 = 0 → serial, PTA7 = 1 → parallel communication for security code entry
TST
TST
or
or
X
DD
DD
DD
RESET
GND
V
V
V
V
(S1)
V
V
V
V
or
TST
or
TST
TST
or
TST
DD
DD
DD
DD
Programmed
Non-$FF
/$FFFF
$FFFE
$FFFF
$FFFF
Blank
Blank
X
X
X
PLL PTC3 PTC4
OFF
OFF
OFF
OFF
OFF
X
X
1
1
X
X
X
Table 18-2. Monitor Mode Signal Requirements and Options
X
0
0
X
X
X
PTC2
(S2)
X
0
1
X
X
X
External
Clock
4.9152
9.8304
9.8304
MHz
MHz
MHz
X
X
X
(1)
CGMOUT
4.9152
4.9152
4.9152
MHz
MHz
MHz
—
—
0
Frequency
2.4576
2.4576
2.4576
Bus
MHz
MHz
MHz
—
—
0
Disabled
Disabled
Disabled
Disabled
Enabled
Enabled
COP
PTA0
X
1
X
1
X
1
X
X
X
Communication
For Serial
PTA7
(S3)
X
0
1
0
1
0
1
X
X
Rate
Baud
9600
9600
9600
DNA
DNA
DNA
—
—
0
(2)
(3) (4)
No operation until reset goes high
PTC3 and PTC2 voltages only required if
IRQ = V
divider
PTC3 and PTC2 voltages only required if
IRQ = V
divider
External frequency always divided by 4
Enters user mode — will encounter an
illegal address reset
Enters user mode
TST
TST
; PTC2 determines frequency
; PTC2 determines frequency
Comment