C167CS datasheet(32/517 Pages) INFINEON

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C167CS

Derivatives

Architectural Overview

User’s Manual

2-15

V2.0, 2000-07

A/D Converter

For analog signal measurement, a 10-bit A/D converter with 24 multiplexed input

channels and a sample and hold circuit has been integrated on-chip. It uses the method

of successive approximation. The sample time (for loading the capacitors) and the

conversion time is programmable and can so be adjusted to the external circuitry.

Overrun error detection/protection is provided for the conversion result register

(ADDAT): either an interrupt request will be generated when the result of a previous

conversion has not been read from the result register at the time the next conversion is

complete, or the next conversion is suspended in such a case until the previous result

has been read.

For applications which require less analog input channels, the remaining channel inputs

can be used as digital input (or IO) port pins.

The A/D converter of the C167CS supports four different conversion modes. In the

standard Single Channel conversion mode, the analog level on a specified channel is

sampled once and converted to a digital result. In the Single Channel Continuous mode,

the analog level on a specified channel is repeatedly sampled and converted without

software intervention. In the Auto Scan mode, the analog levels on a prespecified

number of channels are sequentially sampled and converted. In the Auto Scan

Continuous mode, the number of prespecified channels is repeatedly sampled and

converted. In addition, the conversion of a specific channel can be inserted (injected)

into a running sequence without disturbing this sequence. This is called Channel

Injection Mode.

The Peripheral Event Controller (PEC) may be used to automatically store the

conversion results into a table in memory for later evaluation, without requiring the

overhead of entering and exiting interrupt routines for each data transfer.

Real Time Clock

The C167CS contains a real time clock (RTC) which serves for different purposes:

• System clock to determine the current time and date,

even during idle mode and power down mode (optionally)

• Cyclic time based interrupt, e.g. to provide a system time tick independent of the CPU

frequency without loading the general purpose timers, or to wake up regularly from

idle mode.

• 48-bit timer for long term measurements,

the maximum usable timespan is more than 100 years.

The RTC module consists of a chain of 3 divider blocks, a fixed 8:1 divider, the

reloadable 16-bit timer T14 and the 32-bit RTC timer (accessible via registers RTCH and

RTCL). Both timers count up.

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