Datasheet

Monitor ROM (MON)
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 Data Sheet, Rev. 2.1
Freescale Semiconductor 175
Figure 16-9. Normal Monitor Mode Circuit
Table 16-1. Monitor Mode Entry
$FFFE/
$FFFF
IRQ1
Pin
PTB1 Pin
(PTXMOD1)
PTB0 Pin
(PTXMOD0)
PTA1
Pin
PTA0
Pin
CGMOUT
Bus
Frequency
(f
OP
)
X
V
TST
0 1 0 1
$FF
blank
V
DD
X X 0 1
+
+
+
V
DD
V
TST
MC145407
MC74HC125
68HC908KX8
RST (PTB7/OSC2)
IRQ1
OSC1
V
SS
V
DD
PTA0
V
DD
10 kΩ
0.1 µF
1 kΩ
6
5
2
4
3
1
DB-25
2
3
7
20
18
17
19
16
15
V
DD
V
DD
V
DD
10 µF
10 µF10 µF
10 µF
1
2
4
7
14
3
0.1 µF
10 kΩ
56
+
PTB1 (PTXMOD1)
PTA1 (SERIAL SELECT)
V
DD
10 kΩ
PTB0 (PTXMOD0)
9.8304-MHz
CANNED
OSCILLATOR
0.1 µF
CGMXCLK
2
-----------------------------
CGMOUT
2
--------------------------
CGMXCLK
2
-----------------------------
CGMOUT
2
--------------------------