参数资料
型号: PIC18F442T-I/PT
厂商: Microchip Technology
文件页数: 132/134页
文件大小: 0K
描述: IC MCU FLASH 8KX16 EE A/D 44TQFP
产品培训模块: Asynchronous Stimulus
标准包装: 1,200
系列: PIC® 18F
核心处理器: PIC
芯体尺寸: 8-位
速度: 40MHz
连通性: I²C,SPI,UART/USART
外围设备: 欠压检测/复位,LVD,POR,PWM,WDT
输入/输出数: 34
程序存储器容量: 16KB(8K x 16)
程序存储器类型: 闪存
EEPROM 大小: 256 x 8
RAM 容量: 768 x 8
电压 - 电源 (Vcc/Vdd): 4.2 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-TQFP
包装: 带卷 (TR)
1997 Microchip Technology Inc.
DS30444E - page 97
PIC16C9XX
13.2
LCD Interrupts
The LCD timing generation provides an interrupt that
denes the LCD frame timing. This interrupt can be
used to coordinate the writing of the pixel data with the
start of a new frame. Writing pixel data at the frame
boundary allows a visually crisp transition of the image.
This interrupt can also be used to synchronize external
events to the LCD. For example, the interface to an
external segment driver, such as a Microchip AY0438,
can be synchronized for segment data update to the
LCD frame.
A new frame is dened to begin at the leading edge of
the COM0 common signal. The interrupt will be set
immediately after the LCD controller completes
accessing all pixel data required for a frame. This will
occur at a certain xed time before the frame boundary
as shown in Figure 13-9. The LCD controller will begin
to access data for the next frame within TFWR after the
interrupt.
FIGURE 13-9: EXAMPLE WAVEFORMS IN 1/4 MUX DRIVE
COM0
COM1
COM2
COM3
V3
V2
V1
V0
V3
V2
V1
V0
V3
V2
V1
V0
V3
V2
V1
V0
Frame
Boundary
Frame
Boundary
1 Frame
LCD
Interrupt
occurs
Controller accesses
next frame data
TFINT
TFWR
TFWR = TFRAME/(LMUX1:LMUX0 + 1)
TFINT = (TFWR /2 - (2TCY + 40 ns))
→ min.
(TFWR /2 - (1TCY + 40 ns))
→ max.
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