6-2. KEY/DISPLAY SCAN

Key/display scan and key read are performed at the following timing.

1Key/display scan cycle: 10ms

2 Blanking time: 50us

3 KEY DATA READ timing: Read before 10~100us of strobe signal OFF.

Key/Display-related Register

 

 

Function

 

Address

 

 

R/W

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LED Segment Signal

 

 

 

100000h

 

 

 

W

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

<LED Segment Signal> Write

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Address

Bit7

 

Bit6

 

Bit5

Bit4

Bit3

 

Bit2

 

Bit1

 

Bit0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100000h

DP

 

g

 

f

e

d

 

c

 

 

B

 

a

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

<CPU PORT>

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No.

CPU PORT

Signal to

 

 

Function

 

 

 

 

be used

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

131

 

P150

 

KS0

KEY STROBE SIGNAL 0

 

 

 

 

 

 

 

 

 

 

129

 

P151

 

KS1

KEY STROBE SIGNAL 1

 

 

 

 

 

 

 

 

 

 

128

 

P152

 

KS2

KEY STROBE SIGNAL 2

 

 

 

 

 

 

 

 

 

 

127

 

P153

 

KS3

KEY STROBE SIGNAL 3

 

 

 

 

 

 

 

 

 

 

126

 

P154

 

LS0

LED STROBE SIGNAL 0

 

 

 

 

 

 

 

 

 

 

125

 

P155

 

LS1

LED STROBE SIGNAL 1

 

 

 

 

 

 

 

 

 

 

124

 

P156

 

LS2

LED STROBE SIGNAL 2

 

 

 

 

 

 

 

 

 

 

123

 

P157

 

LS3

LED STROBE SIGNAL 3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

KS3~0 : KEY strobe signal is generated.

LS3~0 : POP UP Display strobe signal is generated.

No.

CPU PORT

Signal to

Function

be used

 

 

 

 

 

 

 

46

P70

KR0#

KEY RETURN SIGNAL 0

 

 

 

 

45

P71

KR1#

KEY RETURN SIGNAL 1

 

 

 

 

44

P72

KR2#

KEY RETURN SIGNAL 2

 

 

 

 

43

P73

KR3#

KEY RETURN SIGNAL 3

 

 

 

 

42

P74

KR4#

KEY RETURN SIGNAL 4

 

 

 

 

41

P75

KR5#

KEY RETURN SIGNAL 5

 

 

 

 

40

P76

KR6#

KEY RETURN SIGNAL 6

 

 

 

 

39

P77

KR7#

KEY RETURN SIGNAL 7

 

 

 

 

14

P140

KR8#

KEY RETURN SIGNAL 8

 

 

 

 

13

P141

KR9#

KEY RETURN SIGNAL 9

 

 

 

 

R0#~KR9# : Flat Keyboard KEY Return signal

KR0#~KR7# : Normal Keyboard KEY Return signal

No.

CPU PORT

Signal to

Function

be used

 

 

 

 

 

 

 

12

P142

MODE#

MODE KEY SIGNAL

 

 

 

 

11

P143

FSR#

FEED SENS SIGNAL

 

 

 

 

The mode key switch and other signals are read at CPU ports P142 and P143 at the key strobe timing.

Reading is made 10~100us before the strobe signal OFF..

P142

ST0 :

MODE Key SRV

“0” SRV mode

 

ST1 :

MODE Key PGM

“0” PGM mode

 

ST2 :

MODE Key VOID

“0” VOID mode

 

ST3 :

MODE Key OP X/Z

“0” OP X/Z mode

 

ST4 :

MODE Key REG

“0” REG mode

 

ST5 :

MODE Key MGR

“0” MGR mode

 

ST6 :

MODE Key X1/Z1

“0” X1/Z1 mode

 

ST7 :

MODE Key X2/Z2

“0” X2/Z2 mode

P143

ST10 : Receipt feed

“0” Receipt feed

 

ST11: Journal feed

“0” Journal feed

 

ST13 : Keypad select

“1” Flat key

 

 

 

“1” JNormal key

The Flat Keyboard takes key data in twice during the strobe period. For read timing, refer to the timing chart below.

588us ±20us

KS0 - 3

 

 

 

 

 

 

 

 

 

(0h~Fh repeat)

0h

 

1h

 

2h

 

Fh

 

0h

 

 

 

 

 

 

 

 

 

Key Return Sinnal

 

10 - 100us

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

950

25us

 

50

10us

 

 

 

 

 

 

 

 

 

 

 

 

LS0 - 3

0h

Fh

 

1h

Fh

 

Fh

0h

(0h~9h repeat)

 

9h

Max.10us

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LED Segment

1ST DIGIT

 

2nd DIGIT

 

 

 

1ST DIGIT

 

 

 

 

 

Signal

DISPLAY DATA

 

DISPLAY DATA

 

 

 

DISPLAY DATA

 

 

BLANK

 

 

BLANK

 

BLANK

 

 

 

 

 

 

 

 

 

ER-A520U/ER-A530U

HARDWARE DESCRIPTION

 

 

 

 

– 12 –

Page 13
Image 13
Sharp ER-A520, ER-A530 service manual KEY/DISPLAY Scan

ER-A520, ER-A530 specifications

The Sharp ER-A530 and ER-A520 are advanced electronic cash registers designed to cater to the needs of small and medium-sized businesses. These models are known for their reliability, user-friendly interfaces, and robust features that enhance operational efficiency in retail environments.

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Both models boast an intuitive and ergonomic keypad layout, making it easy for staff to learn and operate the register with minimal training. The bright and easy-to-read LCD display is another key characteristic, allowing operators to view transaction details clearly in various lighting conditions. This user-friendly design reduces errors and speeds up the checkout process, making it ideal for busy retail settings.

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In summary, the Sharp ER-A530 and ER-A520 electronic cash registers stand out in the market for their reliable performance, user-friendly design, and a comprehensive set of features that accommodate the unique needs of retailers. These registers not only enhance customer service but also provide critical insights for inventory and sales management, making them an excellent choice for businesses looking to streamline their operations.