MC68HC908LD64 Datasheet, PDF (139/362 Pages) Freescale Semiconductor, Inc – Microcontrollers

Monitor ROM (MON)
Functional Description
V_DD
10 kΩ
68HC908LD64
RST
V_TST
0.1 µF
1
+
10 µF
3
4
10 µF
+2
DB-25
2
5
3
6
7
MC145407
10 Ω
SW2
C
(See NOTES) D
20 pF
20
+
10 µF
18
17
10 µF ^VDD
19 ⁺
16
15
X1
9.8304 MHz
20 pF
10 MΩ
V_DD
0.1 µF
V_DD
0.1 µF
V_DD
1
14
V_DD
MC74LCX125
2
3
10 kΩ
6
5
IRQ
OSC1
OSC2
V_SS1
V_SS2
V_SSA
V_DD1
V_DD2
V_DDA
DPLUS0
DMINUS0
PTD4/DDCSCL
PTD5/DDCSDA
PTA0
4
PTC3
V_DD
V_DD
7
10 kΩ
10 kΩ
A
SW1
(See NOTES) B
PTC0
PTC1
PTA7
NOTES:
1. SW2: Position C — For monitor mode entry when IRQ = V_TST:
SW1: Position A — Bus clock = OSCXCLK ÷ 4
SW1: Position B — Bus clock = OSCXCLK ÷ 2
2. SW2: Position D — For monitor mode entry when reset vector is blank ($FFFE and $FFFF = $FF):
Bus clock = OSCXCLK ÷ 4; PTC0, PTC1, and PTC3 voltages are not required.
3. See Table 24-4 for IRQ voltage level requirements.
Figure 10-1. Monitor Mode Circuit
MC68HC908LD64 — Rev. 3.0
Freescale Semiconductor
Monitor ROM (MON)
Data Sheet
139