參數(shù)資料
型號: HD66726
廠商: Hitachi,Ltd.
英文描述: Graphics LCD 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: 圖形液晶顯示控制器/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): 45/117頁
文件大小: 1549K
代理商: HD66726
HD66726
45
CGROM Bank Control 1/2
RL5–1:
Switch the CGROM memory bank for a given line. Bank 0 and bank 1 of the CGROM
incorporate 240 and 192 fonts, respectively, and can display 432 fonts in total. Bits RL1–RL5 select
CGROM bank 0/1 for each display line unit. When RL1 = 0, the first line selects bank 0. When RL1 = 1,
the first line selects bank 1. Bits RL2, RL3, RL4, and RL5 select the memory banks in the second to fifth
lines. For details, see the CGROM Bank Switching Function section.
R/W RS DB7
DB0
0
0
DB6 DB5 DB4 DB3 DB2 DB1
0
1
0
1
1
RL5 RL4
0
0
0
1
1
0
0
RL3 RL2 RL1
(0)
Figure 18 CGROM Bank Control 1/2 Instruction
Key Scan Control
IRE:
When IRE = 1, it permits interrupts when a key is pressed. This causes interrupts to occur in the
standby period when the oscillator clock is halted, as well as key scan interrupts during normal operation,
allowing system wake-up.
KF1-0:
Set the key scan cycle. The following table shows the key scan pulse width and key scan cycle
used when the oscillation frequency (fosc) is 50 kHz, which depend on the oscillation frequency. For
details, see the Key Scan Control section.
R/W RS DB7
DB0
0
0
DB6 DB5 DB4 DB3 DB2 DB1
0
1
1
0
1
KF1 KF0
IRE
Figure 19 Key Scan Control Instruction
Table 24
KF Bits and Key Scan Cycle
KF1
KF0
Key Scan Pulse Width
Key Scan Cycle
0
0
0.16 ms
0.64 ms (32 clock cycles)
0
1
0.32 ms
1.28 ms (64 clock cycles)
1
0
0.64 ms
2.56 ms (128 clock cycles)
1
Note:
1
1.28 ms
5.12 ms (256 clock cycles)
The data is a value obtained when the oscillation frequency (fosc) is 50 kHz. The value depends on
the oscillation frequency.
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