D6122G NEC, D6122G Datasheet - Page 6

• Manufacturer Part Number: D6122G
• Description: Search -----> UPD6122G
• Manufacturer: NEC

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3. CUSTOM CODE (CUSTOM CODE, CUSTOM CODE’) SETTING
3.1
6
Ver I
Ver II
The custom code is set in two different ways depending on whether Ver I or Ver II specifications are employed.
Remark The PD6121-001 has Ver I specifications and is pin-compatible with the PD1943G, and the PD6122-
A custom code setting example is shown below.
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 ( PD6121-001, 6122-
001).
Configuration example
Standard versions with Ver I specs. ( PD6121-001, PD6122-001)
Figure 3-2. Example of Custom Code Setting for Ver I Specifications ( PD6121-001, 6122-001)
001 has Ver I specifications and is pin-compatible with the PD6102G.
If used as pin-compatible products, please note the following points.
Fixed by external diode bit
C
C
1 Connect the SEL pin to V
2 Change the capacitance of the capacitor connected to the resonator connection pin (Refer to
0
3
, C
to C
9. ELECTRICAL SPECIFICATIONS).
1
, C
7
2
...
... Fixed by connecting CCS pin and either one of
pins KI/O
Fixed by absence or presence of external pull-up
resistor for KI/O
CCS
Higher 8 bits of custom code
V
DD
0
to KI/O
KI/O
Figure 3-1. Custom Code Setting
0
6
, KI/O
7
KI/O
DD
.
7
1
KI/O
2
KI/O
V
3
DD
KI/O
4
KI/O
Fixed by external pull-up resistor bit
Fixed by external pull-up resistor (KI/O
KI/O
5
5
) bit
Lower 8 bits of custom code’
KI/O
6
KI/O
7
PD6121, 6122
0
to