13657 Slajd10 (177)

MC6840 TIMER COITNTER

V. .

CRX4

TABLE 3 - PTM OPERATING MODĘ SELECTION

0	0	0	Continuous Operating Modę: Gale 1 or Write to Latches or Reset Causes Counter Initialization
1	0	0	Frequencv Comparison Modę: Interrupt If Gate ^ | ^is< Counter Time Out Continuous Operating Modę Gate l or Reset Causes Counter Initia izauon
0	1	0
1	1	0	Pulse Width Comparson Modę: Interrupt «f Gate ^^ is< Counter Time Out
0	0	1	Single Shot Modę: Gate J or Wrrte to Latches or Reset Causes Counter inttialization
1	0	1	F'equency Comparison Modę: Interrupt If Gate j’ 1 is> Counter Time Out
0	1	1	Single Shot Modę: Gate l or Reset Causes Counter initialization
1	1	1	Pulse Width Comparison Modę: Interrupt If Gate ^is> Counter Time Out

Contro! Register			Timer Operating Modę
CRX3	CRX4	CRX5
0	•	0	Continuous	Synthesizer
0	•	1	Single-Shot
1	0	•	Frequency Comparison	Measyemen:
1	1	•	Pulse Wiath Comparison

PROGRAMOWANIE TRYBU PRACY