m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 141

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

2. APPLICATION
Fig. 2.5.24 Control procedure [FLD automatic display and Key-scan using digit pin]
Control procedure :
Figure 2.5.24 shows a control procedure.
Initialization
FLD automatic
display RAM
(Address:0FB0
FLDM1
FLDM2
FLDDP
P0SDR
P2DPR
P8SPR
PASPR
P2D
ICON2 (Address:3F
FLDM2 (Address:37
IREQ2 (Address:3D
Wait for 1 or more cycles
(Address:36
(Address:37
(Address:38
(Address:32
(Address:33
(Address:34
(Address:35
(Address:05
16
to 0FC9
RESET
~ ~
16
16
16
16
16
16
16
16
16
)
16
16
)
)
)
)
)
)
)
)
16
)
)
), bit6
, bit6
, bit1
10000000
00000001
00001001
00000011
00000000
00000000
00000000
00000000
a data to be
displayed
3819 Group USER’S MANUAL
0
1
1
2
2
2
2
2
2
2
2
Set the related functions for the FLD automatic
display.
Set segment/digit/port.
Set the bits 7 to 4 of the Port P2 direction register
used for the Key- scan to the input mode.
To turn on the display of the corresponding segment : set to “1”
To turn off the display of the corresponding segment : set to “0”
Set the FLD digit interrupt request bit to “0”.
Wait until completing to write data to the FLD
digit interrupt request bit.
FLD digit interrupt : Enabled
Start the FLD automatic display.
Note : The display data is rewritten at any time.
2.5 FLD controller
MITSUBISHI MICROCOMPUTER
3819 Group
( Note)
127