ST9 datasheet(99/146 Pages) STMICROELECTRONICS

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ST9 USER GUIDE

Figure 46

. A/D Converter Block Diagram

The conversion cycle can either be started in Single mode, by a trigger (software or hardware,

the later being internal or external) or in Continuous mode, restarted as soon as the previous

cycle is finished.

Each channel uses one bit of a port (the port depends on the variant of the ST9), and the con-

version result is stored in a 16-bit register. Sixteen such registers are available, named

AD_D0R to AD_D15R. These 16 bit registers are data registers are made up of two 8-bit reg-

A/D End of conversion or

AWD interrupt to the core

3 bits of

CICR

4 bits of

AD_ICR

Priority

Mechanism

1 bit of

AD_IVR

A/D or AWD

Interrupt Vector

selection

Pending & Mask bits

4 bits of

AD_CRR

Compare Result

Analog Watchdog

Threshold

registers 16-bit H/L(Ch.A)

Threshold

registers 16-bit H/L(Ch.B)

4 bits of

CLR1

Data

A/D Converter

AIN pins

channels 0 to 16

Autoscan Logic

See fully detailed

diagram of the

A/D converter in Section 6

Synchronisation to

Start/Stop the

A/D Converter

4 bits of

CLR1

EXTRG pin

3 bits of

AD_ICR

4 bits of

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