MC68HC908GR8 Datasheet, PDF (132/286 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Monitor ROM (MON)
0.1 μF
68HC08
RST
1
+
10 μF
3
4
10 μF
+2
DB-25
2
5
3
6
7
MC145407
V_TST
(SEE NOTE 3)
10 kΩ
C
D
(SEE NOTES 2
SW2 ^{AND 3)}
V_DDA
10 k
0.033 μF
20
6–30 pF
C ^SW3
(SEE NOTE 2)
+
10 μF
18
D
C
SW4
(SEE NOTE 2)
32.768 kHz XTAL
17
330 kΩ D
10 kΩ
+
10 μF
V_DD
6–30 pF
19
IRQ
V_DDA
CGMXFC
OSC1
OSC2
PTA1
V_SS
V_SSAD/V_REFL
V_SSA
16
V_DD
15
V_DD
V_DDAD/V_REFH
0.1 μF
V_DD
1
14
MC74HC125
2
3
6
5
V_DD
10 kΩ
PTA0
4
V_DD
7
10 kΩ
PTB0
PTB1
10 kΩ
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. See Table 15-1. Monitor Mode Signal Requirements and Options for IRQ voltage level requirements.
Figure 15-1. Monitor Mode Circuit
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
132
Freescale Semiconductor