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| 型號(hào)： | MSM6442-XXGS-K |
| 廠商： | LAPIS SEMICONDUCTOR CO LTD |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 4.2 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | 14 X 20 MM, 0.80 MM PITCH, PLASTIC, QFP-80 |
| 文件頁(yè)數(shù)： | 3/13頁(yè) |
| 文件大?。?/td> | 177K |
| 代理商： | MSM6442-XXGS-K |
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MSM6442
Semiconductor
NOTES ON USE
Notes on Using Ports 5 and 6 of MSM6442
The MSM6442 uses Port 5 (P5) and Port 6 (P6) to rewrite the display in the LCD and the
dedicated registers in LCD section, and to read the interrupt indication flag.
Writing and reading is completed when data has been written using P5 and P6, in this order
successively. Therefore, if an interrupt occurs during operation of P5 and P6 and these ports are
operated by the interrupt routine, the MSM6442 may not operate normally.
Countermeasure
Disable a process interruption during operation of P5 and P6. Make the program interrupt
disabled when rewriting the display in LCD, rewriting a dedicated register such as the system
control register (SCR), or reading/resetting the interrupt indication flag. Note that the program
examples provided in the User's Manual use the assumption that each program is in the
interrupt disabled state. Therefore, when executing any of the program examples in the
interrupt enabled state, execute the MDI and MEI instructions according to the following
examples:
(1) Writing data into a dedicated register
LAI
m
Set write data m
MDI
Disable interrupt (*1)
OPD 6
LAI
n
Set control command n
OPD 5
MEI
Enable interrupt (*2)
RPBD 5, 3
End of write processing
(2) Reading the interrupt indication flag
LAI
MDI
Disable interrupt (*1)
OPD 6
LAI
0AH Set control command 0AH
OPD 5
IPD
6
Read flag
MEI
Enable interrupt (*2)
RPBD 5, 3
End of read processing
*1 If an accumulator is not saved during interrupt processing, the MDI instruction must be
executed before the LAI instruction is executed.
*2 During actual processing, an interrupt is enabled after the execution of the RPBD 5, 3
instruction.
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