UPD75212ACW データシートの表示（PDF） - NEC => Renesas Technology

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UPD75212ACW

4-BIT SINGLE-CHIP MICROCOMPUTER

NEC => Renesas Technology 

µPD75212A

5.8 FIP CONTROLLER/DRIVER

The FIP controller/driver incorporated in the µPD75212A has the following functions:

• Generates the segment and digit signals by automatically reading the display data memory executing DMA

operation.

• Can select up to a total of 26 display devices in the range of 9 to 16 segments and 9 to 16 digits.

• Can apply the remaining display output as static output.

• Can adjust the brightness at 8 levels using the dimmer function.

• Can apply key scan operations.

• Generates interrupt at the key scan timing (IRQKS)

• Can generate key scan data output from the segment output pin.

• Owns the high-voltage output pin (40 V) which can directly drive the FIP.

• Segment special pins (S0 to S9) : VOD = 40 V, IOD = 3 mA

• Digit output pins (T0 to T15) : VOD = 40 V, IOD = 15 mA

• Can incorporate pull-down resistors bit-wise as mask options.

Differences between µPD75212A and µPD75238 display output function are shown in Table 5-2.

Table 5-2 Differences between µPD75212A and µPD75238 Display Output Function

High-voltage output display

Display data area

Output dual-function pin

Key scan register

µPD75212A

FIP output total : 26

Segment output : 9 to 16

Digit output

: 9 to 16

1C0H to 1FFH

S12 to S15

(PORTH)

KS0, KS1

µPD75238

FIP output total : 34

Segment output : 9 to 24

Digit output

: 9 to 16

1A0H to 1FFH

S0 to S23

(PORT10 to PORT15)

KS0 to KS2

25

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