
121
μ
PD75238
(2) FIP controller/driver functions
The FIP controller/driver contained in the
μ
PD75238 has the following functions:
(a) The FIP controller/driver automatically reads display data and generates a segment signal (DMA
operation) and a digit signal.
(b) An FIP having 9 to 24 segments and 9 to 16 digits can be controlled with the display mode register
(DSPM), digit select register (DIGS), static mode register A (STATA), and static mode register B
(STATB). (Up to 34 display outputs are allowed.)
(c) Any outputs not used for dynamic display can be used as static outputs or output ports.
(d) The dimmer function provides eight levels of intensity.
(e) Hardware that makes key scan application possible
An interrupt (IRQKS) is caused for key scanning (detection of key scan timing).
Key scan data can be output on a segment output with key scan buffers (KS0, KS1, and KS2).
(f)
A high-voltage output pin (40 V) is provided which can directly drive the FIP.
Segment output pins (S0 to S9, S16 to S23): V
OD
= 40 V, I
OD
= 3 mA
Digit output pins (T0 to T15): V
OD
= 40 V, I
OD
= 15 mA
(g) Mask options for display output pins
A pull-down resistor to V
LOAD
can be incorporated bit by bit for T0 to T9 and S0 to S15.
A pull-down resistor to V
LOAD
or V
SS
can be incorporated bit by bit for S16 to S23. V
LOAD
or V
SS
must
be selected in 8-bit units.
(3) Difference of the display output function between the
μ
PD75238,
μ
PD75216A, and
μ
PD75217
Table 4-8 shows the difference of the display output function between the
μ
PD75238,
μ
PD75216A, and
μ
PD75217.
Table 4-8 Difference of the Display Output Function between the
μ
PD75238,
μ
PD75216A, and
μ
PD75217
FIP output total : 26
Segment output : 9 - 16
Digit output
: 9 - 16
1C0H-1FFH
S12-S15 (Port H)
KS0, KS1
μ
PD75238
μ
PD75216A,
μ
PD75217
High-voltage output display
Display data area
Output dual-function pin
Key scan register
FIP output total : 34
Segment output : 9 - 24
Digit output
: 9 - 16
1A0H-1FFH
S0-S23 (Port 10-port 15)
KS0-KS2