
Monitor ROM (MON)
Functional Description
MC68HC908GR8A — Rev 0.0
Technical Data
MOTOROLA
Monitor ROM (MON)
191
Figure 15-1. Monitor Mode Circuit
+
VDDA
MC145407
MC74HC125
RST
IRQ
VDDA
CGMXFC
OSC1
OSC2
VSS
VDD
PTA0
VDD
10 k
0.1
F
10 k
6
5
2
4
3
1
DB-25
2
3
7
20
18
17
19
16
15
VDD
10
F
10
F
10
F
10
F
1
2
4
7
14
3
0.1
F
5
6
+
PTB0
PTB1
68HC08
$FFFF
$FFFE
RESET VECTORS
VSSAD/VREFL
VSSA
VDDAD/VREFH
D
C
D
6–30 pF
32.768 kHz XTAL
10
M
SW2
SW4
SW3
(SEE NOTE 2)
(SEE NOTES 2
(SEE NOTE 2)
(SEE NOTE 3)
Notes:
1.
SW2, SW3, and SW4: Position C — Enter monitor mode using external oscillator.
SW2, SW3, and SW4: Position D — Enter monitor mode using external XTAL and internal PLL.
2.
10 k
0.
01
F
0.033
F
VTST
330 k
AND 3)
PTA1
VDD
10 k
10 k
10 k