m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 50

• Manufacturer Part Number: m3819
• Description: Mitsubishi 8-bit Single-chip Microcomputer 740 Family / 38000 Series
• Manufacturer: Renesas Electronics Corporation.

FLD Data Pointer and FLD Data Pointer
Reload Register
Both the FLD data pointer and FLD data pointer reload register
are 7-bit registers allocated at address 0038
to this address, the data is written to the FLD data pointer reload
register, when reading data from this address, the value in the
FLD data pointer is read.
36
FLD Automatic Display RAM
The FLD automatic display RAM area is the 96 bytes from ad-
dresses 0F80
area can store 6-byte segment data up to 16 digits (maximum).
Addresses 0F80
addresses 0F90
addresses 0FA0
addresses 0FB0
addresses 0FC0
and addresses 0FD0 to 0FDF
16
16
to 0FDF
16
16
16
16
to 0F9F
to 0F8F
to 0FAF
to 0FBF
to 0FCF
16
. The FLD automatic display RAM
16
16
16
16
16
16
are used for P8 segment data,
are used for PA segment data,
are used for P9 segment data,
are used for P3 segment data,
are used for P0 segment data,
are used for P1 segment data.
(FLDDP) 0038
16
. When writing data
16
The FLD data pointer indicates the data address in the FLD auto-
matic display RAM to be transferred to a segment. The FLD data
pointer reload register indicates the first digit address of the most
significant segment.
The value which adds 0F80
memory.
The contents of the FLD data pointer indicate the first address of
segment P1(the contents of the FLD data pointer reload register)
at the start of automatic display. The FLDC data pointer content
changes repeatedly as follows: when transferring the segment P1
data to the segment, the content decreases by –16; when transfer-
ring the segment P0 data, it decreases by –16; when transferring
the segment P3 data, it decreases by –16; when transferring the
segment P9 data, it decreases by –16; when transferring the seg-
ment P8 data, it decreases by –16; when transferring the segment
PA data, it increases by +79. Once it reaches “00”, at the next tim-
ing the value in the FLD data pointer reload register is transferred
to the FLD data pointer. In this way, the 6-byte data of P1, P0, P3,
P9, P8 and PA segments for 1 digit are transferred.
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
16
to these data is actual address in
3819 Group