Programmable Internal Timer - Panasonic JB-3300 Technical Manual

5.11
Table 5-91 Precompensation Table
PSO PS1 Write Timing Selected Signal
0 0 TYP. (2)
0 1 LATE @
1 0 EARLY G3)
1
1
eee ee
GND
Programmable Internal Timer (8253-5)
This timer is a programmable counter/timer consisting of three of 16-bit
counters. The uses of these counters are given below:
Table 5-10 Usage of the 8253-5 Counter Channels
8253-5 Channel Usage Mode CLK (MHz)
0 Internal timer 1.19318
1 Memory refresh 1.19318
2 Beep frequency generator 1.19318
In Modes 2 and 3, OUT = "H" if GATE = "L".
Memories are refreshed every 4 msec.
Refer to the data sheet for more details on 8253-5.
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