∙BCD - Select Binary/BCD Counting (Bit 0)

0

16-BITS BINARY COUNTER

1

BINARY CODED DECIMAL (BCD) COUNTER

 

(4 DIGITAL)

 

 

N

The count of the binary counter is from 0 up to

ot

65,535 and the count of the BCD counter is

e

from 0 up to 9,999

 

 

Mode Definitions

In 8254, six operating modes can be selected. They are :

ØMode 0: Interrupt on Terminal Count

ØMode 1: Programmable One-Shot.

ØMode 2: Rate Generator.

ØMode 3: Square Wave Rate Generator.

ØMode 4: Software Triggered Strobe.

ØMode 5: Hardware Triggered Strobe.

All detailed description of these six modes are written in Intel Microsystems Components Handbook Volume II Peripherals.

38 ∙ Operation Theorem