Intel 8253 - Timing Waveforms

4-15
Timing Waveforms
FIGURE 17. WRITE
FIGURE 18. READ
FIGURE 19. RECOVERY
FIGURE 20. CLOCK AND GATE
A0 - A1
CS
DATA BUS
WR
(12)
tWW
(13)
tDW
(10)
tSW
(9)
tAW
VALID
tWD (14)
tWA (11)
VALID
A0 - A1
CS
RD
DATA BUS
(2)
tSR
(6)
tAD
(5)
tRD
(4)
tRR
(7)
tDF
tRA (3)
tAR (1)
(8) (15)
tRV
RD, WR
WR
CLK
GATE
OUT
MODE
COUNT
(SEE NOTE)
(17)
tPWH
(18)
tPWL
(16)
tCLK
tGS
(21)
tGW
(27)
tWO
tGS
(23)
tGH
(24)
tGL
tODG (26)
tF (20)
tOD (25)
tGH (24)
NOTE: LAST BYTE OF COUNT BEING WRITTEN
(19)
tR
(22)
(23)
tCL (30)
tWC (28)
82C54