ST72411R 查看數據表（PDF） - STMicroelectronics

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ST72411R

8-BIT MCU WITH SMARTCARD INTERFACE, LCD DRIVER, 8-BIT TIMER, SAFE RESET AND SUPPLY MONITORING

STMicroelectronics 

ST72411R

LCD DRIVER (Cont’d)

5.4.6 Register Description

CONTROL REGISTER (CR)

Read / Write

Reset Value: 0000 0000 (00h)

7

6

5

4

3

2

1

0

-

-

-

-

FS2 FS1 FS0 LCDE

Bit 7:4 = Reserved, Must always be cleared

Bit 3:1 = FS2:0 Frame Frequency selection

These bits allow to select the LCD frame frequen-

cy. It controls the ratio between the input clock

(fOSC/2) and the LCD output clock (fLCD). These

bits are set and cleared by software.

Ration Divider

1/16384

1/8192

1/4096

1/2048

1/1024

1/512

1/256

1/128

FS2

FS1

FS0

1

1

1

1

1

0

1

0

1

1

0

0

0

1

1

0

1

0

0

0

1

0

0

0

5.4.7 LCD RAM Description

The 16-byte LCD RAM is located in memory from

address 0140h to address 014Fh. Each bit of the

LCD RAM is mapped to one picture element of the

LCD panel. If a bit is set, the corresponding picture

element is switched on, otherwise it is switched

off.

After reset, the LCD RAM is not initialized and its

content is indeterminate.

Addr. 7 6 5 4 3 2 1 0

0140h S7 S6 S5 S4 S3 S2 S1 S0

0141h S15 S14 S13 S12 S11 S10 S9 S8

0142h S23 S22 S21 S20 S19 S18 S17 S16

0143h S31 S30 S29 S28 S27 S26 S25 S24

0144h S7 S6 S5 S4 S3 S2 S1 S0

0145h S15 S14 S13 S12 S11 S10 S9 S8

0146h S23 S22 S21 S20 S19 S18 S17 S16

0147h S31 S30 S29 S28 S27 S26 S25 S24

0148h S7 S6 S5 S4 S3 S2 S1 S0

0149h S15 S14 S13 S12 S11 S10 S9 S8

014Ah S23 S22 S21 S20 S19 S18 S17 S16

014Bh S31 S30 S29 S28 S27 S26 S25 S24

014Ch S7 S6 S5 S4 S3 S2 S1 S0

014Dh S15 S14 S13 S12 S11 S10 S9 S8

014Eh S23 S22 S21 S20 S19 S18 S17 S16

014Fh S31 S30 S29 S28 S27 S26 S25 S24

Bit 0 = LCDE LCD enable

This bit is set and cleared by software.

0: LCD disabled

1: LCD enabled

While the LCD is disabled (LCDE bit cleared), all

Segment and Common pins are high impedance.

44/71

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