
438
CHAPTER 24 LCD CONTROLLER
■
Use of External Divider Resistors
As the V1 pin is connected to V
SS
(GND) internally via a transistor, when using external divider
resistors, you can shut off the current flowing to the resistors when the LCD controller is halted by
connecting the V
SS
end of the divider resistors to the V1 pin. Figure 24.2-6 shows the states with
external divider resistors used.
Figure 24.2-6 States with External Divider Resistors Used
1) To connect the external divider resistors without being affected by the internal divider resistors,
you need to write "0" to the drive voltage control bit in the LCDC control register
(LCDCC:VSEL) to disconnect all the internal divider resistors. Write "1" to the V3 to V1 select
bits in LCDC enable register 1 (LCDCE1:VE1) so that the target ports can be used as power
supply pins to drive the LCD.
2) When the internal divider resistors are disconnected, writing a value other than "00
B
" to the
display mode select bits (MS1 and MS0) in the LCDC control register turns on the LCDC
enable transistor (Q1) and current flows in the external divider resistors.
3) Writing "00
B
" to the display mode select bits (MS1 and MS0) turns off the LCDC enable
transistor (Q1) and this stops the current flow in the external divider resistors.
Note:
The externally connected RX resistors depend on the LCD you are using. Select appropriate
resistances to match the LCD.
2R
R
R
R
LCDC enabled
Q1
V
3
V
2
V
1
Vcc
V3
V2
V1
VR
RX
RX
RX
V
1
to V
3
: Voltages at V1 to V3 pins
Содержание F2 MC-8FX Family
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Страница 30: ...16 CHAPTER 1 DESCRIPTION 1 FPT 64P M23 FPT 64P M24 2 For the I O circuit type refer to 1 8 I O Circuit Type ...
Страница 34: ...20 CHAPTER 1 DESCRIPTION ...
Страница 35: ...21 CHAPTER 2 HANDLING DEVICES This chapter gives notes on using 2 1 Device Handling Precautions ...
Страница 38: ...24 CHAPTER 2 HANDLING DEVICES ...
Страница 39: ...25 CHAPTER 3 MEMORY SPACE This chapter describes memory space 3 1 Memory Space 3 2 Memory Map ...
Страница 43: ...29 CHAPTER 4 MEMORY ACCESS MODE This chapter describes the memory access mode 4 1 Memory Access Mode ...
Страница 56: ...42 CHAPTER 5 CPU ...
Страница 73: ...59 CHAPTER 6 CLOCK CONTROLLER ...
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Страница 104: ...90 CHAPTER 7 RESET ...
Страница 105: ...91 CHAPTER 8 INTERRUPTS This chapter explains the interrupts 8 1 Interrupts ...
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Страница 218: ...204 CHAPTER 13 WATCH PRESCALER ...
Страница 257: ...243 CHAPTER 16 8 16 BIT COMPOSITE TIMER ...
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Страница 301: ...287 CHAPTER 17 16 BIT PPG TIMER ...
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Страница 382: ...368 CHAPTER 21 UART SIO DEDICATED BAUD RATE GENERATOR ...
Страница 390: ...376 CHAPTER 22 I2C ...
Страница 395: ...381 CHAPTER 22 I2C ...
Страница 399: ...385 CHAPTER 22 I2C ...
Страница 430: ...416 CHAPTER 23 10 BIT A D CONVERTER ...
Страница 476: ...462 CHAPTER 24 LCD CONTROLLER ...
Страница 482: ...468 CHAPTER 25 LOW VOLTAGE DETECTION RESET CIRCUIT ...
Страница 494: ...480 CHAPTER 26 CLOCK SUPERVISOR ...
Страница 507: ...493 CHAPTER 27 REAL TIME CLOCK ...
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Страница 532: ...518 CHAPTER 27 REAL TIME CLOCK ...
Страница 536: ...522 CHAPTER 28 256 KBIT FLASH MEMORY ...
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Страница 564: ...550 CHAPTER 29 EXAMPLE OF SERIAL PROGRAMMING CONNECTION ...
Страница 595: ...581 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
Страница 596: ...582 INDEX Index ...
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Страница 599: ...585 Pin Function Index V2 LCD power supply driving pin 2 439 V3 LCD power supply driving pin 3 439 ...
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