Specifications

Counter/Timers (8254)
Table 11-1
Read-Back Command Example.
COMMAND
D7 D6 D5 D4 D3 D2 D1 D0
DESCRIPTION RESULTS
11000010 Read back count and Count and status
status of counter 0 latched for counter 0
11100100 Read back status of Status latched for
counter 1 counter 1
11101100 Read back status of Status latched for
counters 2,1 counter 2 but not
counter 1
11011000 Read back count of Count latched for
counter 2 counter 2
11000100 Read back count and Count latched for
status of counter 1 counter 1, but not
status
11100010 Read back status Command ignored,
of counter 1 status already latched
for counter 1
11-15