參數(shù)資料
型號： HD66727
廠商： Hitachi,Ltd.
英文描述： Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function(帶鍵掃描功能的圖形LCD控制器/驅(qū)動器)
中文描述： 低功耗點陣液晶顯示控制器/鍵掃描功能（帶鍵掃描功能的圖形液晶顯示控制器/驅(qū)動器驅(qū)動程序）
文件頁數(shù)： 31/98頁
文件大小： 1576K
代理商： HD66727
HD66727
31
Handling Unused Character Patterns:
1. EPROM data outside the character pattern area: This is ignored by character generator ROM for display
operation so any data is acceptable.
2. EPROM data in CGRAM area: Always fill with zeros.
3. Treatment of unused user patterns in the HD66727 EPROM: According to the user application, these
are handled in either of two ways:
a. When unused character patterns are not programmed: If an unused character code is written into
DDRAM, all its dots are lit, because the EPROM is filled with 1s after it is erased.
b. When unused character patterns are programmed as 0s: Nothing is displayed even if unused
character codes are written into DDRAM. (This is equivalent to a space.)
Instructions
Outline
Only the instruction register (IR) and the data register (DR) of the HD66727 can be controlled by the MPU.
Before starting internal operation of the HD66727, control information is temporarily stored in these
registers to allow interfacing with various peripheral control devices or MPUs which operate at different
speeds. The internal operation of the HD66727 is determined by signals sent from the MPU. These signals,
which include register selection bit (RS), read/write bit (R/W), and the data bus (DB0 to DB7), make up the
HD66727 instructions. There are four categories of instructions that:
Control display
Control key scan
Control power management
Set internal RAM addresses
Perform data transfer with internal RAM
Normally, instructions that perform data transfer with internal RAM are used the most. However, auto-
incrementation by 1 (or auto-decrementation by 1) of internal HD66727 RAM addresses after each data
write can lighten the program load of the MPU.
While an instruction is being executed for internal operation, or during reset, no instruction other than the
busy flag/key scan read instruction can be executed.
Because the busy flag is set to 1 while an instruction is being executed, check it to make sure it is 0 before
sending another instruction from the MPU. If an instruction is sent without checking the busy flag, the time
between the first instruction issue and next instruction issue must be longer than the instruction execution
time itself. Refer to Table 23 for the list of each instruction execution cycles (clock pulses). The execution
time depends on the operating clock frequency (oscillation frequency).
相關(guān)PDF資料
PDF描述
HD66728 112 x 80-dot Graphics LCD Controller/Driver(112 x 80點圖形LCD控制器)
HD66730 Dot-Matrix Liquid Crystal Display Controller/Driver(點陣液晶顯示控制器/驅(qū)動器)
HD66731 Dot-Matrix Liquid Crystal Display Controller/Driver(點陣液晶顯示控制器/驅(qū)動器)
HD66731A00TB0L 122 x 32 pixel format, Compact LCD size
HD66731A00TA0L Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD66727A03 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver
HD66727A03BP 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver
HD66727A03TA0 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver
HD66727A03TA0L 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function
HD66727A04 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver
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