Freescale Semiconductor, Inc.
Technical Data — MC68HC705C8A
List of Figures
Figure
Title
Page
1-1
1-2
1-3
1-4
1-5
1-6
1-7
1-8
1-9
1-10
1-11
Option Register (Option) . . . . . . . . . . . . . . . . . . . . . . . . . . .23
MC68HC705C8A Block Diagram . . . . . . . . . . . . . . . . . . . . .25
40-Pin PDIP/Cerdip Pin Assignments . . . . . . . . . . . . . . . . .26
44-Lead PLCC/CLCC Pin Assignments. . . . . . . . . . . . . . . .27
44-Pin QFP Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . .27
42-Pin SDIP Pin Assignments . . . . . . . . . . . . . . . . . . . . . . .28
Bypassing Layout Recommendation . . . . . . . . . . . . . . . . . .29
Crystal Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
2-Pin Ceramic Resonator Connections . . . . . . . . . . . . . . . .31
3-Pin Ceramic Resonator Connections . . . . . . . . . . . . . . . .31
External Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
2-1
2-2
Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
I/O Register Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
3-1
3-2
3-3
3-4
3-5
3-6
Programming Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .044
Accumulator (A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .045
Index Register (X) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .045
Stack Pointer (SP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .046
Program Counter (PC) . . . . . . . . . . . . . . . . . . . . . . . . . . . .046
Condition Code Register (CCR). . . . . . . . . . . . . . . . . . . . .047
4-1
4-2
4-3
4-4
4-5
External Interrupt Internal Function Diagram . . . . . . . . . . . .52
External Interrupt Timing . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Port B I/O Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Interrupt Stacking Order. . . . . . . . . . . . . . . . . . . . . . . . . . . .58
Reset and Interrupt Processing Flowchart . . . . . . . . . . . . . .59
MC68HC705C8A — Rev. 3
MOTOROLA
Technical Data
List of Figures
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