參數(shù)資料
型號(hào)： M38B79MFH-XXXXFP
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, MROM, 4.2 MHz, MICROCONTROLLER, PQFP100
封裝： 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100
文件頁(yè)數(shù)： 68/112頁(yè)
文件大?。?/td> 1862K
代理商： M38B79MFH-XXXXFP
38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
56
Fig. 56 Timing using FLD blanking interrupt
The FLD blanking interrupt is generated when the FLD data
pointer (address 0EF816) reaches “FF16”. The FLD automatic dis-
play output is turned off for a duration of 1 Tdisp, 2 Tdisp, or
3 Tdisp depending on post-interrupt settings. During this time,
key scanning that makes use of FLD segments can be achieved.
When the key scanning is performed with the segment during
key-scan blanking time Tscan, follow the procedure described
below:
(1) Write “0” to the automatic display control bit (bit 0 of address
0EF416).
(2) Set the port corresponding to the segment for key scanning to
the output port.
(3) Perform key scanning.
(4) Write “1” to the automatic display control bit.
s Note
When performing a key-scan according to the above steps 1 to 4,
take the following points into consideration.
1. Do not set the display start bit (bit 1 of address 0EF416) to “0”.
2. Do not set “1” in the ports corresponding to digits.
Tdisp
Tscan
TnTn-1Tn-2
T4
T3
T2
T1
Tn
Tn-1 Tn-2
Segment setting by software
FLD blanking interrupt generated at the
falling of edge of the last timing
FLD digit output
Repeat cycle
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