MC68HC908QY2 MOTOROLA [Motorola, Inc], MC68HC908QY2 Datasheet - Page 117

• Manufacturer Part Number: MC68HC908QY2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

MOTOROLA
monitor
monitor
monitor
Forced
Forced
MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
Mode
mode
mode
mode
mode
V
User
2
3
5
1 F
1 F
TST
DB9
+
+
V
1
3
4
5
V
V
7
8
IRQ RST
V
V
Figure 9-3. Monitor Mode Circuit (External Clock, with High Voltage)
or
TST
DD
SS
DD
SS
C1+
C1–
C2+
C2–
V
Table 9-1. Monitor Mode Signal Requirements and Options
MAX232
X
X
X
DD
(programmed)
V+
V–
$FFFE/
(blank)
(blank)
$FFFF
$FF
$FF
$FF
Not
16
15
2
10
X
6
1 F
9
V
DD
+
+
2
1 F
PTA1 PTA4
74HC125
1
X
X
X
1
3
Monitor ROM (MON)
+
1 F
74HC125
X
X
X
6
0
4
External
10 k
9.8304
9.8304
5
Clock
(MHz)
X
X
V
V
DD
9.8304 MHz CLOCK
TST
10 k
0.1 F
9.1 V
1 k
Frequency
2.4576
2.4576
*
(MHz)
Bus
V
3.2
—
DD
RST (PTA3)
OSC1 (PTA5)
IRQ (PTA2)
PTA0
Disabled
Disabled
Disabled
Enabled
COP
PTA1 and PTA4 voltages
are required. RST and
OSC1 functions are
active
OSC1 function is active.
RST and IRQ only
available if later
configured.
RST, IRQ, and OSC1
only available if later
configured.
Enters user mode
RST pin only available if
later configured
Functional Description
Monitor ROM (MON)
PTA1
PTA4
Comment
V
V
* Value not critical
DD
SS
10 k
10 k
V
DD
0.1 F
*
*
V
117
DD