3819_03 Datasheet, PDF (134/218 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

2. APPLICATION
Control procedure :
Figure 2.5.17 shows a control procedure.
MITSUBISHI MICROCOMPUTER
3819 Group
2.5 FLD controller
RESET
Initialization
FLDM1 ^{(Address:3616)}
FLDM2 ^{(Address:3716)}
FLDDP (Address:3816)
P0SDR ^{(Address:3216)}
P2DPR ^{(Address:3316)}
P8SPR (Address:3416)
PASPR ^{(Address:3516)}
P2D ^{(Address:0516)}
100000112
000000012
000010012
000000112
000000002
000000002
000000002
000000002
q _{Set related functions for using the FLD automatic}
display.
q _{Set segment/digit /port.}
q _{Set the bits 7 to 4 of the Port P2 direction register}
used for the Key-scan to input mode.
FLD automatic
display RAM
(Address:0FB016 to 0FC916)
a data to be
displayed
IREQ2 (Address:3D 16), bit6 0
q _{To turn on the display of the corresponding segment : set to “1”}
q _{To turn off the display of the corresponding segment : set to “0”}
( Note)
q _{Set the FLD blanking interrupt request bit to “0”.}
Wait for 1 or more cycles
q _{Wait until completing to write data to the FLD}
blanking interrupt request bit.
ICON2 (Address:3F 16) , bit6 1
FLDM2 (Address:37 16), bit1 1
q _{FLD blanking interrupt : Enabled}
q _{Start the FLD automatic display.}
Main processing
Note : The display data is re-written at any time.
Fig. 2.5.17 Control procedure [FLD automatic display and Key-scan using segment pin]
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3819 Group USER’S MANUAL