upd75212a Renesas Electronics Corporation., upd75212a Datasheet - Page 25

• Manufacturer Part Number: upd75212a
• Description: 4-bit Single-chip Microcomputer
• Manufacturer: Renesas Electronics Corporation.

5.8
High-voltage output display
Display data area
Output dual-function pin
Key scan register
The FIP controller/driver incorporated in the PD75212A has the following functions:
Differences between PD75212A and PD75238 display output function are shown in Table 5-2.
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.
•
• Digit output pins (T0 to T15)
Can incorporate pull-down resistors bit-wise as mask options.
FIP CONTROLLER/DRIVER
Segment special pins (S0 to S9)
Table 5-2 Differences between PD75212A and PD75238 Display Output Function
FIP output total
Segment output : 9 to 16
Digit output
1C0H to 1FFH
S12 to S15
(PORTH)
KS0, KS1
: V
: V
OD
OD
= 40 V, I
= 40 V, I
PD75212A
: 26
: 9 to 16
OD
OD
= 15 mA
= 3 mA
FIP output total
Segment output : 9 to 24
Digit output
1A0H to 1FFH
S0 to S23
(PORT10 to PORT15)
KS0 to KS2
PD75238
: 34
: 9 to 16
PD75212A
25