MC68HC12 Datasheet, PDF (222/478 Pages) Motorola, Inc – The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit

Oscillator
Table 13-2. MC68HC912Dx128P EXTAL–VSS, XTAL–VSS Capacitor Values vs. Maximum
ESR, Shunt Capacitance, and VDDPLL setting
Maximum ESR vs. EXTAL–VSS or XTAL–VSS capacitor value, 1MHz resonators
3 4400
Shunt
Capacitance ^{5 3800}
(pF)
(VDDPLL=0)
7 3300
10 2700
5500
4650
3950
2900
6700
5400
4150
2300
8100
5350
3100
1700
8500
4000
2300
1200
6350
2900
1650
850
3700
1650
950
500
C_EXTAL-VSS (pF)
47pF 39pF 33pF 27pF 22pF 18pF 13pF
2250
1000
550
300
10pF
Maximum ESR vs. EXTAL–VSS or XTAL–VSS capacitor value, 2MHz resonators
3 1100
Shunt
Capacitance ⁵
975
(pF)
7 850
(VDDPLL=0)
10 725
1425
1225
1050
875
1750
1500
1275
1025
2200
1825
1525
1175
2700
2150
1750
1325
3200
2475
1925
1050
3975
2350
1375
725
C_EXTAL-VSS (pF)
47pF 39pF 33pF 27pF 22pF 18pF 13pF
3925
1825
1050
550
10pF
Maximum ESR vs. EXTAL–VSS or XTAL–VSS capacitor value, 4MHz resonators
3 270
350
440
560
700
850 1100
Shunt
Capacitance ⁵
240
310
380
470
570
680
850
(pF)
7 210
270
320
400
480
550
670
(VDDPLL=VDD)
10 180
220
260
320
370
420
490
3 250
330
410
520
660
800 1040
Shunt
Capacitance ⁵
230
290
350
440
540
640
800
(pF)
7 200
250
300
370
450
520
630
(VDDPLL=0)
10 170
210
250
300
350
400
450
C_EXTAL-VSS (pF)
47pF 39pF 33pF 27pF 22pF 18pF 13pF
1310
970
740
520
1230
910
700
500
10pF
Technical Data
222
Oscillator
MC68HC912DT128A — Rev 4.0
MOTOROLA