UPD75238GJ

Manufacturer Part NumberUPD75238GJ
Description4 BIT SINGLE-CHIP MICROCOMPUTER
ManufacturerNEC [NEC]
UPD75238GJ datasheet
 
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(2) FIP controller/driver functions
The FIP controller/driver contained in the 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
• Digit output pins (T0 to T15): V
(g) Mask options for display output pins
• A pull-down resistor to V
LOAD
• A pull-down resistor to V
LOAD
be selected in 8-bit units.
(3) Difference of the display output function between the PD75238, PD75216A, and PD75217
Table 4-8 shows the difference of the display output function between the PD75238, PD75216A, and
PD75217.
Table 4-8 Difference of the Display Output Function between the PD75238, PD75216A, and PD75217
High-voltage output display
Display data area
Output dual-function pin
Key scan register
= 40 V, I
= 3 mA
OD
OD
= 40 V, I
= 15 mA
OD
OD
can be incorporated bit by bit for T0 to T9 and S0 to S15.
or V
can be incorporated bit by bit for S16 to S23. V
SS
PD75238
PD75216A, PD75217
FIP output total : 34
FIP output total : 26
Segment output : 9 - 24
Segment output : 9 - 16
Digit output
: 9 - 16
Digit output
1A0H-1FFH
1C0H-1FFH
S0-S23 (Port 10-port 15)
S12-S15 (Port H)
KS0-KS2
KS0, KS1
PD75238
or V
must
LOAD
SS
: 9 - 16
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