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4 timing chart, 5 data receiving control, 6 buffering – Citizen Systems 291 User Manual

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CBM-290/291 User’s Manual

18

CITIZEN

6.4 Timing chart

(1) Data Input and Printing Timing

T1, T2, T3

: 0.5 micro sec. MIN

T4

: 270 ns MAX

T5

: 2.3 micro sec. TYP

T6

: 500 ms MIN (On supplying power)

6.5 Data receiving control

When BUSY signal is "LOW", data from the host can be received.

When it being "HIGH", data can not be

received.

6.6 Buffering

4 K bytes input buffer is incorporated. Due to this large buffer, host side is released immediately.

ACK is not outputted.