UPD75206CW NEC [NEC], UPD75206CW Datasheet - Page 22

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UPD75206CW

Manufacturer Part Number
UPD75206CW
Description
4-BIT SINGLE-CHIP MICROCOMPUTER
Manufacturer
NEC [NEC]
Datasheet

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22
5.8
The FIP controller/driver of the PD75206 has the following functions:
Note
FIP CONTROLLER/DRIVER
Automatically read display data memory by means of DMA, and generate segment signals and digit
signals.
Number of display elements can be freely selected in a range of 9 to 12 segments and 9 to 16 digits,
and a total of 26 segments/digits or less.
Unused display outputs can be used as static outputs.
Luminosity can be adjusted in eight steps by a dimmer function.
Can be used for key scan.
High-voltage output pins that can directly drive FIP (40 V).
Can be connected to pull-down resistor in bit units by mask option.
The FIP controller/driver can only operate in the high and medium speeds (PCC = 0011B or 0010B)
of the main system clock (SCC.0 = 0). It may cause errors with any other clock or in the standby mode.
Thus, be sure to stop FIP controller operation (DSPM.3 = 0) and then shift the unit to any other clock
mode or the standby mode.
Interrupt (IRQKS) occurs when a specified key is scanned.
Key scan data can be output from a segment output pin.
Sement pins (S0-S9): V
Digit output pins (T0-T15): V
Key Scan Registers (KS0, KS1)
Segment Data Latch (12)
Display Data Memory
S0-S9
10
10
(48
12
4 Bits)
Fig. 5-8 FIP Controller/Driver Block Diagram
High-Voltage Output Buffer
OD
T15/S10,
T14/S11
= 40 V, I
2
2
2
OD
2
Selector
= 40 V, I
4
T13/PH0-
T10/PH3
Internal Bus
OD
Port H
4
4
= 3mA
4
OD
= 15 mA
Display
Mode
Register
4
T0-T9
Digit
Select
Register
10
10
Digit Signal
Generator
4
Dimmer
Select
Register
4
V
LOAD
Key Scan
Flag (KSF)
V
PRE
Generator
PD75206
IRQKS
Signal

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