- 您现在的位置：买卖IC网 > Sheet目录307 > ADE7518ASTZF8-RL (Analog Devices Inc)IC ENERGY METER MCU 8K 64LQFP
ADE7518
Table 75. LCD Pointer SFR (LCDPTR, 0xAC)
Bit
7
Mnemonic
R/W
Default
0
Description
Read or Write LCD Bit. If this bit = 1, the data in LCDDAT is written to the address indicated by
the LCDPTR[5:0] bits.
6
5 to 0
Reserved
ADDRESS
0
0
Reserved.
LCD Memory Address (see Table 78).
Table 76. LCD Data SFR (LCDDAT, 0xA E)
Bit
7 to 0
Mnemonic
LCDDATA
Default
0
Description
Data to be written into or read out of the LCD Memory SFRs.
Table 77. LCD Segment Enable 2 SFR (LCDSEGE2, 0xED)
Bit
7 to 4
3
2
1
0
Mnemonic
Reserved
FP19EN
FP18EN
FP17EN
FP16EN
Default
0
0
0
0
0
Description
Reserved.
FP19 Function Select Bit. 0 = general-purpose I/O, 1 = LCD function.
FP18 Function Select Bit. 0 = general-purpose I/O, 1 = LCD function.
FP17 Function Select Bit. 0 = general-purpose I/O, 1 = LCD function.
FP16 Function Select Bit. 0 = general-purpose I/O, 1 = LCD function.
LCD SETUP
The LCD Configuration SFR (LCDCON, 0x95) configures the
LCD module to drive the type of LCD in the user end system.
The BIAS and LMUX[1:0] bits in this SFR should be set according
to the LCD specifications.
The COM2/FP28 and COM3/FP27 pins default to LCD segment
lines. Selecting the 3× multiplex level in the LCD Configuration
SFR (LCDCON, 0x95) by setting LMUX[1:0] = 10 changes the
FP28 pin functionality to COM2. The 4× multiplex level selection,
LMUX[1:0] = 11, changes the FP28 pin functionality to COM2
and the FP27 pin functionality to COM3.
LCD segments FP0 to FP15 and FP26 are enabled by default.
Additional pins are selected for LCD functionality in the LCD
Segment Enable SFR (LCDSEGE, 0x97) and the LCD Segment
Enable 2 SFR (LCDSEGE2, 0xED), where there are individual
enable bits for the FP16 to FP25 segment pins. The LCD pins do
not have to be enabled sequentially. For example, if the alternate
function of FP23, the Timer 2 input, is required, any of the
other shared pins, FP16 to FP25, can be enabled instead.
The Display Element Control section contains details about
setting up the LCD data memory to turn individual LCD
segments on and off. Setting the LCDRST bit in the LCD
Configuration SFR (LCDCON, 0x95) resets the LCD data
memory to its default (0). A power-on reset also clears the
LCD data memory.
LCD TIMING AND WAVEFORMS
An LCD segment acts like a capacitor that is charged and
discharged at a certain rate. This rate, the refresh rate, determines
the visual characteristics of the LCD. A slow refresh rate results
in the LCD blinking on and off between refreshes. A fast refresh
rate presents a screen that appears to be continuously lit. In
addition, a faster refresh rate consumes more power.
The frame rate, or refresh rate, for the LCD module is derived
from the LCD clock, f LCDCLK . The LCD clock is selected as 2048 Hz
or 128 Hz by the CLKSEL bit in the LCD Configuration SFR
(LCDCON, 0x95). The minimum refresh rate needed for the
LCD to appear solid (without blinking) is independent of the
multiplex level.
The LCD waveform frequency, f LCD , is the frequency at which
the LCD switches the active common line. Thus, the LCD
waveform frequency depends heavily on the multiplex level.
The frame rate and LCD waveform frequency are set by the
f LCDCLK , the multiplex level, and the FD[3:0] frame rate selection
bits in the LCD Clock SFR (LCDCLK, 0x96).
The LCD module provides 16 different frame rates for f LCDCLK
= 2048 Hz, ranging from 8 Hz to 128 Hz for an LCD with 4×
multiplexing. Fewer options are available with f LCDCLK = 128 Hz,
ranging from 8 Hz to 32 Hz for a 4× multiplexed LCD. The
128 Hz clock is beneficial for battery operation because it
consumes less power than the 2048 Hz clock. The frame rate is
set by the FD[3:0] bits in the LCD Clock SFR (LCDCLK, 0x96);
see Table 72 and Table 73.
The LCD waveform is inverted at twice the LCD waveform
frequency, f LCD . This way, each frame has an average dc offset
of zero. ADC offset degrades the lifetime and performance of
the LCD.
Rev. 0 | Page 84 of 128
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
ADE7569ASTZF16
IC ENERGY METER MCU 16K 64LQFP
ADE7752BARWZ-RL
IC ENERGY METERING 3PHASE 24SOIC
ADE7755ARSZ
IC ENERGY METERING 1PHASE 24SSOP
ADE7757ARNZRL
IC ENERGY METERING 1PHASE 16SOIC
ADE7758ARWZRL
IC ENERGY METERING 3PHASE 24SOIC
ADE7761AARSZ-RL
IC ENERGY METERING 1PHASE 20SSOP
ADE7761BARSZ-RL
IC ENERGY METERING 1PHASE 20SSOP
ADE7768ARZ-RL
IC ENERGY METERING 1PHASE 16SOIC
相关代理商/技术参数
ADE7566
制造商:AD 制造商全称:Analog Devices 功能描述:Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver
ADE7566ACPZF16
制造商:AD 制造商全称:Analog Devices 功能描述:Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver
ADE7566ACPZF161
制造商:AD 制造商全称:Analog Devices 功能描述:Single-Phase Energy Measurement IC with 8052 MCU, RTC and LCD driver
ADE7566ACPZF162
制造商:AD 制造商全称:Analog Devices 功能描述:Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver
ADE7566ACPZF16-RL
制造商:AD 制造商全称:Analog Devices 功能描述:Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver
ADE7566ACPZF16-RL1
制造商:AD 制造商全称:Analog Devices 功能描述:Single-Phase Energy Measurement IC with 8052 MCU, RTC and LCD driver
ADE7566ACPZF16-RL12
制造商:AD 制造商全称:Analog Devices 功能描述:Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver
ADE7566ACPZF8
制造商:AD 制造商全称:Analog Devices 功能描述:Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver