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CHAPTER 10 APPLICATIONS OF FIP CONTROLLER/DRIVER
CHAPTER 10 APPLICATIONS OF FIP CONTROLLER/DRIVER
The functions of the FIP controller/driver are listed below. The differences between the
μ
PD78044F,
μ
PD78044H,
μ
PD780208, and
μ
PD780228 subseries are listed in Table 10-1.
(1) Segment signal output (DMA operation) by automatically reading display data and automatic output of
digit signals
(2) Display mode register controlling FIP (fluorescent indicator panel) (See Table 10-1.)
(3) Those pins not used for FIP display can be used either as output port or I/O port pins (however, pins FIP0
through FIP12 of the
μ
PD780208 subseries and pins FIP0 through FIP15 of the
μ
PD780228 subseries
are dedicated to display output).
(4) Brightness can be set to one of eight steps by using display mode register 1 (DSPM1).
(5) Hardware for key scan application
Generates an interrupt request signal (INTKS) indicating the key scan timing
Key scan signals are output from segment output pins if data for key scanning is set to port (see Table
10-1).
Key scan data output timing can be detected by key scan flag (KSF).
Whether the key scan timing is inserted can be selected (only for the
μ
PD780228 subseries).
(6) High-voltage output buffer directly driving FIP
(7) Pull-down resistor can be connected by mask option to display output pins.
(8) Any digit signal output timing can be set by selecting display mode 2 with display mode register 0 (DSPM0)
(
μ
PD780208 subseries only).
Caution The format of the registers incorporated into the
μ
PD780228 subseries differs from that
of the registers incorporated into the
μ
PD78044F,
μ
PD78044H, and
μ
PD780208 subseries.
When using any of the sample programs described in this chapter with the
μ
PD780228
subseries, replace the register settings with those for the
μ
PD780228 subseries.
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