Revision as of 22:32, 26 December 2013

In this tutorial we will see 8051 timers. We will use the 8051 timers to generate a precise delay of 1 sec.

8051 timers/counters

The 8051 has 2 timers/counters.

They can be used to generate precise timing, i.e., we can measure time between events. The unit is then called timer.
It can also be used to count external events, known as counter.
Timer 1 is also used for generating baud rate in serial communication, which we will discuss in the next tutorial

T0
TH0								TL0
D15	D14	D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0

TMOD
D7	D6	D5	D4	D3	D2	D1	D0
Gate	C/T	M1	M0	Gate	C/T	M1	M0

@@ Line 9: / Line 9: @@
 ==Timer Counter Operation==
-{| class="wikitable" style="text-align:center;background-color:#ffffcc;margin: 1em auto 1em auto;"
+{| class="wikitable" style="text-align:center;background-color:#87A96B;margin: 1em auto 1em auto;"
 |-
 !colspan = '16'|T0
@@ Line 18: / Line 18: @@
 |}
-{| class="wikitable" style="text-align:center;background-color:#008B8B;margin: 1em auto 1em auto;"
+{| class="wikitable" style="text-align:center;background-color:#87A96B;margin: 1em auto 1em auto;"
 |-
-!colspan = '8'|Register Name
+!colspan = '8'|TMOD
 |-
 |D7||D6||D5||D4||D3||D2||D1||D0
@@ Line 29: / Line 29: @@
 {{Box|type=l_green_light|text=<br/>
 }}
-{| class="wikitable" style="background-color:#ffffff;"
+{| class="wikitable" style="background-color:#87A96B;"
 |-
 ! Register !! Operation