參數(shù)資料
型號(hào)： M38B79FFFP
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述： 單芯片8位CMOS微機(jī)
文件頁(yè)數(shù)： 55/109頁(yè)
文件大小： 1559K
代理商： M38B79FFFP
38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
PRELIMINARY
Notice: This is not a final specification.
change.
Some parametric limits are subject to
55
Fig. 55 Timing using digit interrupt
FLD Automatic Display Start
Automatic display starts by setting both the automatic display con-
trol bit (bit 0 of address 0EF4
16
) and the display start bit (bit 1 of
address 0EF4
16
) to
“
1
”
. The RAM contents at a location apart from
the start address of the automatic display RAM for each port by
(FLD data pointer (address 0EF8
16
)
–
1) are output to each port.
The FLD data pointer (address 0EF8
16
) counts down in the Tdisp
interval. When the count results in
“
FF
16
”
, the pointer is reloaded
and starts counting over again. Before setting the display start bit
(bit 1 of address 0EF4
16
) to
“
1
”
, be sure to set the FLD/port switch
registers, digit output set switch registers, FLDC mode register,
Tdisp time set register, Toff1 time set register, Toff2 time set regis-
ter, and FLD data pointer.
During FLD automatic display, the display start bit always keeps
“
1
”
, and FLD automatic display can be interrupted by writing
“
0
”
to
this bit.
Key-scan and Interrupt
Either the FLD digit interrupt or FLD blanking interrupt can be se-
lected using the Tscan control bits (bits 2, 3 of address 0EF4
16
).
The FLD digit interrupt is generated when the Toff1 time in each
timing expires (at rising edge of digit output). Key scanning that
makes use of FLD digits can be achieved using each FLD digit in-
terrupt. To use FLD digit interrupts for key scanning, follow the
procedure described below:
(1) Read the port value each time the interrupt occurs.
(2) The key is fixed on the last digit interrupt.
The output digit positions can be determined by reading the FLD
data pointer (address 0EF8
16
).
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