12 control register, Cs5460a – Cirrus Logic CS5460A User Manual

Page 50

CS5460A

DS487F5

CRDY

Conversion Ready. Indicates a new conversion is ready. This will occur at the output word rate,

which is usually 4 kHz.

EDIR

Set whenever the EOUT bit asserted (see below) if the accumulated energy is negative.

EOUT

Indicates that enough positive/negative energy has been reached within the internal EOUT En-

ergy Accumulation Register (not accessible to user) to mandate the generation of one or more
pulses on the EOUT pin (if enabled, see Configuration Register). The energy flow may indicate
negative energy or positive energy. (The sign is determined by the EDIR bit, described above).
This EOUT bit is cleared automatically when the energy rate drops below the level that produc-
es a 4 kHz EOUT pin rate. The bit can also be cleared by writing to the Status Register. This
status bit is set with a maximum frequency of 4 kHz (when MCLK/K is 4.096 MHz). When
MCLK/K is not equal to 4.096 MHz, the user should scale the pulse-rate by a factor of
4.096 MHz / (MCLK/K) to get the actual pulse-rate.

DRDY

Data Ready. When running in ’single computation cycle’ or ’continuous computation cycles’

data acquisition modes, this bit will indicate the end of computation cycles. When running cali-
brations, this bit indicates that the calibration sequence has completed, and the results have
been stored in the offset or gain registers.

5.12 Control Register

Address: 28

Default** = 0x000000

STOP

1 = used to terminate the new EEBOOT sequence.

Res

Reserved. These bits must be set to zero.

MECH

1 = widens EOUT and EDIR pulses for mechanical counters.

INTL

1 = converts the INT output to open drain configuration.

SYNC

1 = forces internal A/D converter clock to synchronize to the initiation of a conversion command.

NOCPU

1 = converts the CPUCLK output to a one-bit output port. Reduces power consumption.

NOOSC

1 = saves power by disabling the crystal oscillator for external drive.

STEP

1 = enables stepper-motor signals on the EOUT/EDIR pins.

Res