NJU6624CFG1 데이터 시트보기 (PDF) - Japan Radio Corporation

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NJU6624CFG1

14-CHARACTER 1-LINE DOT MATRIX LCD CONTROLLER DRIVER with SMOOTH SCROLL FUNCTION

Japan Radio Corporation  

NJU6624C

(1-9)Keyscan circuit

The Keyscan circuit consists of a detector block of key pressing and a fetching block of key status. It scans 4x8

key matrix and fetches conditions of 32 keys. Furthermore, it operates correctly against the key roll over input.

-Request signal output

When the NJU6624C detect the key pressing by the key scan circuit, it outputs “H” signal as the request signal

from the “REQ” terminal to notice the key pressing information to an application system.

-Contents of key register renewal

Contents of key register are “0000 0000” in case of no key operation. Contents of key register are not changed in

busy of key data reading operation. Key data is fetched into the key register after 2 clock of the end of a keyscan

cycle and kept by the start of next cycle.

-Key data input terminal and segment terminal

Keyscan signal output terminals operate as segment terminals (SEG1 to SEG8) also and keyscan signals are

output in interval period of segment signals. Key data input terminals (K0 to K3) are pulled up to VDD in busy of

keyscan operation (tKS). In this period, terminals of SEG9 to SEG70 output the voltage of V2 or VLCD2.

-Keyscan OFF mode

Keyscan operation is turned ON or OFF by the instruction. In case of keyscan OFF, the detector of key pressing

is not operating and key data input terminals (K0 to K3) are not pulled up during the period of keyscan (tKS). In

the period of keyscan (tKS), all of segment terminals (SEG1 to SEG70) output the voltage of V2 or VLCD2.

-Example Keyscan

S0

S0

S0

S1

S1

S1

S2

S2

S2

S3

S3

S3

S4

S4

S4

S5

S5

S5

S6

S6

S6

S7

S7

S7

REQ

SEG1/S0

SEG2/S1

SEG3/S2

SEG4/S3

SEG5/S4

SEG6/S5

SEG7/S6

SEG8/S7

tKS

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