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LC7581E Folha de dados(PDF) 10 Page - ON Semiconductor |
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LC7581E Folha de dados(HTML) 10 Page - ON Semiconductor |
10 / 54 page LC75810E/T No.7141-10/54 • CGROM (Character generator ROM) CGROM is the ROM that is used to generate the 240 kinds of 5 × 7, 5 × 8, or 5 × 9 dot matrix character patterns from the 8-bit character codes. CGROM has a capacity of 240 × 45 bits. When a character code is written to DCRAM, the character pattern stored in the CGROM corresponding to the character code is displayed at the position on the LCD corresponding to the DCRAM address loaded into AC. • CGRAM (Character generator RAM) CGRAM is the RAM to which user programs can freely write arbitrary character patterns. Up to 16 kinds of 5 × 7, 5 × 8, or 5 × 9 dot matrix character patterns can be stored. CGRAM has a capacity of 16 × 45 bits. • ALATCH (Additional data latch) ALATCH is the latch that is used to store the ADATA display data for the accessory display. ALATCH has a capacity of 80 bits, and the stored display data is displayed directly without the use of CGROM or CGRAM. • SC (Scroll counter) SC is the counter that is used to scroll the display in the left, right, up, or down directions in dot units. Since this function scrolls in dot units, it implements smooth scrolling. Reset Function The LC75810E and LC75810T are reset when a low level is applied to the RES pin at power on and, in normal mode. On a reset the LC75810E and LC75810T create a display with all LCD panels turned off. However, after a reset applications must set the contents of DCRAM, ALATCH, and CGRAM before turning on display with a “display on/off control” instruction since the contents of these memories are undefined. That is, applications must execute the following instructions. • Set display technique • DCRAM data write • ALATCH data write (If ALATCH is used.) • CGRAM data write (IF CGRAM is used.) • Set AC and SC addresses • Set display contrast (If the display contrast adjustment circuit is used.) After executing the above instructions, applications must turn on the display with a “display on/off control” instruction. Note that when applications turn off in the normal mode, applications must turn off the display with a “display on/off control” instruction. (See the detailed instruction descriptions.) Serial Data Transfer Format • When CL is stopped at the low level Instruction data Up to 144 bits CCB address 8 bits A3 A2 A1 A0 B3 B2 D143 D142 D4 D3 D2 10 0 0 1 1 1 0D0 D1 B1 CE DI CL B0 • When CL is stopped at the high level Instruction data Up to 144 bits CCB address 8 bits A3 A2 A1 A0 B3 B2 D143 D142 D4 D3 D2 0 0 0 11 1 1 0 D0 D1 B1 CE DI CL B0 • CCB address: 4EH • D0 to D143: Instruction data The data is acquired on the rising edge of the CL signal and latched on the falling edge of the CE signal. When transferring instruction data from the microcontroller, applications must assure that the time from the transfer of one set of instruction data until the next instruction data transfer is significantly longer than the instruction execution time. |
Nº de peça semelhante - LC7581E |
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Descrição semelhante - LC7581E |
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