Seiko Instruments G1216B1N000 user manual Busy

Page 13

AN.No.G1216B1N000-3D0E

In order to read the content of the output register, the Chip Select must be selected, D/I must be 1, and R/W must be 1. When executing the “Read” instruction, the contents of the output register stored at that time are output during the time that “E” is 1. When “E” falls, display data of the currently indicated address is written in the output register. After that, the address advances by one.

The contents of the output register are rewritten by the Read instruction. The data is retained by the address set or other instructions. Accordingly, when performing the address set, and next executing the Read instruction, the data of the specified address is not output and the data of the address which is specified is output at the second data read time. Therefore, when setting the address, a dummy read is needed once. See Figure 4.

D / I

R/W

E

Address Output Register

DB0 to DB7

(2)Busy flag

 

 

 

 

 

 

 

 

N

 

N+1

 

N+2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N address data

 

 

 

N+1 address data

 

 

 

Busy

 

Address

 

 

 

 

 

Data Read

 

 

 

 

 

Data Read

 

 

 

 

 

Data Read

 

 

 

 

 

Busy

 

 

 

 

Busy

 

 

 

 

Busy

 

 

 

 

 

 

 

 

 

 

 

 

Check

 

Set

 

 

Check

 

 

(dummy)

 

 

Check

 

 

(N address

 

 

Check

 

 

(N+1 address

 

 

 

 

(Address

 

 

 

 

 

 

 

 

 

 

 

 

data)

 

 

 

 

 

data)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N)

Figure 4 Read Timing

The status when busy flag is “1” means that the module is operating internally. Instructions other than he Status Read are not available at this time. The busy flag is output to DB7 by the Status Read instruction. Ensure that the busy flag is “0” before executing the instruction.

E

 

 

 

 

 

 

 

 

 

 

 

 

 

BUSY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T BUSY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

￿T BUSY ￿

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F￿

F￿

 

F￿is frequency of ￿1 or ￿2 (1 / 2 the source oscillation frequency of HD61203): 215 kHz typ.

Figure 5 Busy Flag

(3)Display ON/OFF Flip/Flop

The display ON/OFF Flip/Flop is a flip-flop function that determines whether the display data corresponding to the RAM data is output to the segment on the LCD (ON status ) or goes to all nonlit status regardless of the RAM data (OFF status). This is controlled by the display ON/OFF instruction. When the RST signal becomes “0,” the display goes to OFF status. This flip-flop status is output to DB 5 by the Status Read instruction.

Even when performing display ON/OFF, the data inside the RAM is not affected.

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Contents AN.No.G1216B1N000-3D0E USER’S ManualCopyright 1993 by Seiko Instruments Inc Contents General Symbol Conditions Min Typ Max Unit Input High +80 Temperature StoragePower supply voltage Voltage25 C Vopr=13.0 Viewing angle Min Typ Max Unit Remark∅ = 25 C Vopr=13.0 Contrast 25 C Vopr=13.0−20 To +70 Storage temp. range AN.No.G1216B1N000-3D0E Definition of response timeNumber of LED LedaChips=20 LedcDB1 DB0DB2 DB3CS2 CS1 Circuit ConfigurationV c, V d, V f FRM CS R/WLSB MSBBusy Page COM2 COM1COM3 COM4Operational Amplifier Bias R2= 9 4 R1= 5 R1 MPU Operating InstructionsCS1 CS2 140 450To DB7 Test point RL = 2.4 k = 11 kRise time 200 Reset timeDetailed explanation Display ON/OFF Code FunctionD/I DB7 DB0 AN.No.G1216B1N000-3D0E Display start line CodeDisplay start line=0 Display start line=1 Display start line =2 Display start line=3AN.No.G1216B1N000-3D0E Address page set Code Display Data RAM Address ConfigurationReset =10 k Ω Voltage V opr 13.5 13.0 12.5 11.5 10.5=1.2 k Ω Variable resistor=LED forward voltage =Input voltage power voltageV=Allowable LED forward current a Leda LedcZ80 PIO MPU Connection DiagramD0 to D7 A0 to A7 DB0 to DB7 A0 to A15 Decoder Iorq RST CS1Precautions 11, 12, 17 9, 11, 12, 17, 18, 19LC drive voltage 10, 16, 17Seiko Instruments Inc