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CDP1878C
CMOS Dual Counter-Timer
Intersil
CDP1878C Datasheet PDF : 13 Pages
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CDP1878C
MEMORY
CLOCK XTAL
ADDRESS
LINES
CLEAR
MWR
MRD
TPA
MAO
MA1
MA2
MA7
V
SS
INT
CDP1802
TACL, TBCL
RESET
TPB/WR
RD
TPA
A0
A1
A2
CS
IO/MEM
INT
COUNTER - TIMER
DB0 - DB7
TAG
GATE
INPUTS
TBG
TAO
TAO
TIMER
OUTPUTS
TBO
TBO
DATA BUS
FIGURE 8. TYPICAL CDP1802 MEMORY-MAPPED SYSTEM
LATCH HIGH-ORDER
TPA
ADDRESS FOR CS
ADDRESS
HIGH BYTE
LOW BYTE
TPB/WR
DATA LATCHED
DATA FROM CPU
TO COUNTER-TIMER
VALID DATA
FIGURE 9. CDP1800-SERIES MEMORY-MAPPING WRITE CYCLE TIMING WAVEFORMS
TPA
ADDRESS
RD
HIGH BYTE
LOW BYTE
OUTPUT DRIVERS
ENABLED DISABLED
DATA FROM
COUNTER-TIMER
TO CPU
VALID DATA
FIGURE 10. CDP1800-SERIES MEMORY-MAPPING READ CYCLE TIMING WAVEFORMS
4-100
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