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Auxiliary Timer/Counter Channels

50 – Reference VSBC-6 Reference Manual

Auxiliary Timer/Counter Channels

The VSBC-6 includes three uncommitted 8254 type counter/timer channels for general

application program use. Control signals for the three channels are available on connector J6.

UMPER

ONFIGURATION

Jumper V2 selects the clock source for channels 4 and 5. Options include:

• Internal 6 MHz timebase

• External clock from connector J6

• Cascading channels 4 and 5 together for 32-bit counter/timer operations

See page 20 for jumper configuration details.

XTERNAL

ONNECTIONS

Table 27: Counter/Timer I/O Connector

Signal

Name Function

1 OCTC3 CTC Channel 3 Output

2 GND Digital Ground

3 ICTC4 CTC Channel 4 Input

4 GND Digital Ground

5 OCTC4 CTC Channel 4 Output

6 GND Digital Ground

7 ICTC5 CTC Channel 5 Input

8 GND Digital Ground

9 OCTC5 CTC Channel 5 Output

10 GND Digital Ground

OUNTER

/ T

IMER

EGISTERS

Table 28: Counter / Timer Registers

Mnemonic R/W Address Name

T3CNT R/W 0044h Timer 3 Count Load/Read

T4CNT R/W 0045h Timer 4 Count Load/Read

T5CNT R/W 0046h Timer 5 Count Load/Read

TCW W 0047h Timer Control Word

PERATION

Operational details for this industry standard 8254 type counter/timer chip are beyond the scope

of this manual. Register details, operational modes, and programming information can be

obtained from the VersaLogic website by downloading the 8254.PDF data sheet.

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Sharp VL-A10K Informations techniques Page 62