UPD78320 Datasheet, PDF (38/88 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCONTROLLER

µPD78320, 78322
3.8 A/D CONVERTER
The µPD78322 incorporates a high-speed, high-resolution 10-bit analog/digital (A/D) converter. This A/D converter is
equipped with eight analog inputs (AN0 to AN7) and A/D conversion result register (ADCR) which holds the conversion
results.
Upon termination of conversion, the interrupt which can start the macro service is generated.
Figure 3-5. A/D Converter Block Diagram
AN0
AN1
AN2
AN3
AN4
AN5
AN6
AN7
Sample & Hold Circuit
D/A Converter
Comparator
AVREF
AVSS
ADM (8)
8
Internal Bus
SAR (10)
10
10
ADCR (10)
10
Internal Bus
3.9 SERIAL INTERFACE
The µPD78322 is equipped with the following two independent channels for the serial interface function.
• Asynchronous serial interface
• Clocked serial interface
• 3-wire serial I/O mode
• Serial bus interface mode (SBI mode)
Since the µPD78322 incorporates a baud rate generator, it can set any serial transfer rate irrespective of the operating
frequency. The baud rate generator functions for the 2-channel serial interface in common.
The serial transfer rate can be selected from 75 bps to 19.2 Kbps by setting the mode register.
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