UPD6121 View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD6121

REMOTE CONTROL TRANSMISSION CMOS IC

NEC => Renesas Technology 

µPD6121, 6122

* 3. CUSTOM CODE (CUSTOM CODE, CUSTOM CODE’) SETTING

The custom code is set in two different ways depending on whether Ver I or Ver II specifications are employed.

Figure 3-1. Custom Code Setting

Ver I

Ver II

Higher 8 bits of custom code

Fixed by external diode bit

C0, C1, C2 ... Fixed by connecting CCS pin and either one of

pins KI/O0 to KI/O7

C3 to C7 ... Fixed by absence or presence of external pull-up

resistor for KI/O6, KI/O7

Lower 8 bits of custom code’

Fixed by external pull-up resistor bit

Fixed by external pull-up resistor (KI/O0 to

KI/O5) bit

Remark The µPD6121-001 has Ver I specifications and is pin-compatible with the µPD1943G, and the µPD6122-

001 has Ver I specifications and is pin-compatible with the µPD6102G.

If used as pin-compatible products, please note the following points.

1 Connect the SEL pin to VDD.

2 Change the capacitance of the capacitor connected to the resonator connection pin (Refer to

9. ELECTRICAL SPECIFICATIONS).

A custom code setting example is shown below.

* 3.1 Standard versions with Ver I specs. (µPD6121-001, µPD6122-001)

Each of the higher 8 bits of the custom code is set to “1” when a diode is connected between the CCS pin and

the corresponding KI/O pin, and is set to “0” when no diode is connected. If a pull-up resistor is connected to

the KI/O pin corresponding to one of the lower 8 bits of the custom code’, the bit is first set to “1”. Based on the

1’s information of the lower 8 bits of the custom code’, the corresponding bit of the higher 8 bits of the custom

code is then captured and not inverted. The non-inverted value is finally overwritten to the corresponding bit of

the lower 8 bits of the custom code’. The inverse occurs when no pull-up resistor is connected.

It follows from the above that the custom code can be set in 65,536 different ways depending on whether or not

a diode and/or pull-up resistor are present.

Please refer to Figure 3-2 Example of Custom Code Setting for Ver I Specifications (µPD6121-001, 6122-

001).

Figure 3-2. Example of Custom Code Setting for Ver I Specifications (µPD6121-001, 6122-001)

Configuration example

CCS

KI/O0 KI/O1 KI/O2 KI/O3 KI/O4 KI/O5 KI/O6 KI/O7

VDD

VDD

6

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