ADMC331 datasheet(26/36 Pages) AD

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ADMC331

–26–

REV. B

System Controller Registers

The system controller includes three registers, MODECTRL,

SYSSTAT and IRQFLAG registers. The format of these regis-

ters is shown at the end of the data sheet.

The MODECTRL register controls different multiplexing,

PWM interrupt and operating modes:

• Bit 0 and 1 control the multiplexing of the ADC auxiliary

channels.

• Bit 2 enables/disables the

PWMTRIP interrupt: if the bit is

set the interrupt is enabled.

• Bit 3 enables/disables the PWMSYNC interrupt: if the bit is

set the interrupt is enabled.

• Bit 4 controls the multiplexing of the SPORT1 pins: if the bit

is set DR1B is selected.

• Bit 5 controls the configuration of SPORT1 as a UART inter-

face: if the bit is set UART mode is enabled.

• Bit 6 selected the PWM operating mode: single or double

duty cycle update modes. If the bit is set double update mode

is selected.

• Bit 7 selects the ADC counter frequency: if the bit is set full

DSP clkout frequency is selected.

• Bit 8 selects the Auxiliary PWM operating mode: offset or

independent modes: if the bit is set independent mode is

selected.

The SYSSTAT register displays various status information:

• Bit 0 indicates the status of the

PWMTRIP pin: if this bit is

high, then

PWMTRIP pin is high and no PWMTRIP is oc-

curring, if this bit is low, then the PWM is currently shut

down.

• Bit 1 indicates the status of the watchdog flag register: this bit

is set following a watchdog timeout.

• Bit 2 indicates the status of the PWMPOL pin: if this bit is

set, the PWMPOL pin is high and active high PWM outputs

will be produced.

• Bit 3 indicates the status of the PWM timer.

• Bit 4 indicates the status of the

PWMSR pin: if this bit is set

to a logic one, the

PWMSR pin is low and switched reluc-

tance mode is enabled.

The IRQFLAG register indicates the occurrence of PWM

interrupts:

• Bit 0 indicates that a

PWMTRIP interrupt, either hardware of

software, has occurred.

• Bit 1 indicates that a PWMSYNC interrupt has occurred.

The address, name, used bits and function of all motor control

peripheral registers of the ADMC331 are tabulated in Table X.

In addition, the relevant DSP core registers are tabulated in

Table XI. Full details of the DSP core registers can be obtained

by referring to the ADSP-2171 sections of the ADSP-2100 Family

User’s Manual, Third Edition.

Development Kit

To facilitate device evaluation and programming, an evaluation

kit (ADMC331-EVAL KIT) is available from Analog Devices.

The evaluation kit consists of an evaluation board and the

Motion Control Debugger software. The evaluation kit con-

tains latest programming and device information. It is recom-

mended that the evaluation kit be used for initial program

development.

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