mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 167

• Manufacturer Part Number: mc68hc908sr12
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
Freescale Semiconductor
DB-25
Notes:
10 µF
10 µF
2
3
7
1. For monitor mode entry when SW2 at position C (IRQ1 = V
2. SW2, SW3, and SW4: Position C — Enter monitor mode using off-chip oscillator only.
3. See
4. See
+
+
SW2, SW3, and SW4: Position D — Enter monitor mode using 32.768kHz XTAL and internal PLL.
SW1: Position A — Bus clock = CGMXCLK ÷ 4
SW1: Position B — Bus clock = CGMXCLK ÷ 2
1
3
4
2
5
6
Table 24-5
Table 10-1
MC145407
for IRQ1 voltage level requirements.
for other monitor mode entry configurations.
Figure 10-1. Monitor Mode Circuit
20
18
17
19
16
15
+
+
10 µF
10 µF
32.768 kHz XTAL
4.9152MHz/9.8304MHz
Monitor ROM (MON)
6–30 pF
V
1
2
6
4
7
DD
MC74HC125
(SEE NOTE 3)
6–30 pF
330 kΩ
(SEE NOTE 1)
10 kΩ
5
14
3
V
D
C
C
C
D
V
V
TST
TST
D
DD
DD
A
):
SW2
SW4
(SEE NOTE 2)
SW3
(SEE NOTE 2)
B
0.033 µF
(SEE NOTES 2
10 kΩ
SW1
0.1 µF
0.1 µF
AND 3)
10 kΩ
V
V
DD
DD
V
DD
RST
IRQ1
CGMXFC
OSC1
OSC2
V
V
V
V
V
V
V
PTA0
PTC1
PTA1
PTA2
SS
SSA
SSAM
REFL
DD
DDA
REFH
68HC908SR12
RESET VECTORS
$FFFE
$FFFF
Functional Description
Monitor ROM (MON)
Data Sheet
167