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<<Go Back to Chip Location Reference
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L8, MC68HC11E9 Microcontroller |
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Pin |
Assignments |
Pin notes |
Circuit Configuration |
IDM Function |
|
1 |
VSS |
GND |
Common GND |
Power Supply GND |
|
2 |
MODB/VSTBY |
Boot Configuration |
5VDC via 4.7k pull resistor |
MCU Boot configuration |
|
3 |
MODA/LIR |
Boot Configuration |
Common GND via zero ohm resistor jumper |
MCU Boot configuration |
|
4 |
STRA/AS |
? |
NC |
Not used |
|
5 |
E |
Output (¼ clock) |
NC |
Not used |
|
6 |
STRB/R/W |
? |
NC |
Not used |
|
7 |
EXTAL |
8MHZ Crystal/clock |
Fundamental Mode |
MCU Clock |
|
8 |
XTAL |
8MHZ Crystal/clock |
Fundamental Mode |
MCU Clock |
|
9 |
PC0/A0/D0 |
Output |
Drives a transistor below (L19) |
SMPS enable/disable ? |
|
10 |
PC1/A1/D1 |
Output |
Drives (L15-P10) |
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|
11 |
PC2/A2/D2 |
Output |
Drives (L11-P2) |
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12 |
PC3/A3/D3 |
Output |
Feeder Signal |
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13 |
PC4/A4/D4 |
Output |
Drives (L10-P11) |
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14 |
PC5/A5/D5 |
Input |
Driven by (L3-P1) |
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15 |
PC6/A6/D6 |
Input |
Driven by (L3-P7) |
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16 |
PC7/A7/D7 |
Input |
Driven by (L10-P2) |
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17 |
RESET |
Input |
Driven by (L20-P4) |
Brownout-power up supervisor control |
|
18 |
XIRQ |
Input |
Connected with (L8-P19) Common 10k pull up resistor |
Not used |
|
19 |
IRQ |
Input |
Connected with (L8-P18) Common 10k pull up resistor |
Not used |
|
20 |
PD0/RxD |
I/O ? |
Driven by (L13-P2) via 4.7k series resistor |
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21 |
PD1/TxD |
Output |
Drives a transistor to the left of (L19) |
IDM Serial port line? |
|
22 |
PD2/MISO |
Output |
Drives (L12-P10) |
Digital Potentiometer COUT |
|
23 |
PD3/MOSI |
Output |
Drives (L12-P9) |
Digital Potentiometer DQ |
|
24 |
PD4/SCK |
Output |
Drives (L12-P7) |
Digital Potentiometer CLK |
|
25 |
PD5/SS |
Output |
Drives (L12-P6) |
Digital Potentiometer /RST |
|
26 |
VDD |
Power/In |
Common 5VDC |
+5 Volt |
|
27 |
PA7/PAI/OC1 |
? |
NC |
Not used |
|
28 |
PA6/OC2/OC |
Output |
Drives (L4-P7) |
TTL IDM FEED BACK |
|
29 |
PA5/OC3/OC1 |
Output |
Drives (L15-P2) |
Fuel Delivery Enable |
|
30 |
PA4/OC4/OC1 |
Output |
Drives a transistor below (L14) |
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31 |
PA3/OC5/OC1 |
Input |
Driven by (L9-P8) |
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32 |
PA2/IC1 |
Input |
Driven by (L15-P11) |
Fuel Delivery feedback |
|
33 |
PA1/IC2 |
Input |
Driven by (L4-P1) |
TTL CID |
|
34 |
PA0/IC3 |
Input |
TTL Fuel Delivery Signal |
|
|
35 |
PB7/A15 |
Output |
Drives (L2-P13) |
Fuel Injector 8 Signal |
|
36 |
PB6/A14 |
Output |
Drives (L1-P5) |
Fuel Injector 6 Signal |
|
37 |
PB5/A13 |
Output |
Drives (L2-P10) |
Fuel Injector 5 Signal |
|
38 |
PB4/A12 |
Output |
Drives (L1-P2) |
Fuel Injector 4 Signal |
|
39 |
PB3/A11 |
Output |
Drives (L2-P5) |
Fuel Injector 3 Signal |
|
40 |
PB2/A10 |
Output |
Drives (L1-P13) |
Fuel Injector 7 Signal |
|
41 |
PB1/A9 |
Output |
Drives (L2-P2) |
Fuel Injector 2 Signal |
|
42 |
PB0/A8 |
Output |
Drives (L1-P10) |
Fuel Injector 1 Signal |
|
43 |
PE0/AN0 |
Analog |
3920/(3920+110000) High voltage reference via resistor divider |
High voltage monitor |
|
44 |
PE4/AN4 |
Analog |
3920/(3920+16200) 12 volt internal supply |
?charge pump? |
|
45 |
PE1/AN1 |
Analog |
3920/(3920+110000) Left feeder driver reference |
Left feeder monitor |
|
46 |
PE5/AN5 |
Analog |
Through a few passives ends up at (L7) |
? |
|
47 |
PE2/AN2 |
Analog |
Gain monitor |
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|
48 |
PE6/AN6 |
Analog |
3920/(3920+16200) 12Volt supply reference |
12 voltage supply monitor |
|
49 |
PE3/AN3 |
Analog |
3920/(3920+110000) Right feeder driver reference |
Right feeder monitor |
|
50 |
PE7/AN7 |
Analog |
3920/(3920+110000) Feeder driver reference |
Feeder monitor |
|
51 |
VRL |
GND/IN/ |
Common GND |
Power Supply GND |
|
52 |
VRH |
Power/In/ |
Common 5VDC |
+5 Volt |