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FIGURE 15. CDP1800 SERIES INPUT/OUTPUT MAPPING TIMING WAVEFORMS WITH OUTPUT INSTRUCTION

FIGURE 16. CDP1800 SERIES INPUT/OUTPUT MAPPING TIMING WAVEFORMS WITH INPUT INSTRUCTION

PARAMETER

(V)

LIMITS

UNITS

CDP1879

CDP1879C-1

(NOTE 1)

MIN

MAX

(NOTE 1)

MIN

MAX

Read Cycle Times (See Figure 17)

Data Access from Address

5

-

400

-

400

ns

10

-

190

-

-

Read Pulse Width

5

270

-

270

-

10

160

-

-

-

Data Access from Read

5

-

375

-

375

10

-

170

-

-

Address Hold after Read

50

-

0

-

10

0

-

-

-

Output Hold after Read

5

50

230

50

230

10

40

130

-

-

Chip Select Setup to TPA

5

50

-

50

-

10

30

-

-

-

NOTE:

1. Time required by a limit device to allow for the indicated function.

VALID DATA

DATA FROM MEMORY

N LINES

RD

TPA

TO REAL-TIME CLOCK

TPB/WR

DATA LATCHED

VALID DATA

OUTPUT DRIVERS ENABLED

OUTPUT DRIVERS

DISABLED

DATA FROM

RD

TPB/WR

TPA

REAL-TIME CLOCK

TO MEMORY

N LINES

CDP1879, CDP1879C-1