CS89712 datasheet(81/170 Pages) CIRRUS

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CS89712

DS502PP2

DBGEN: Setting this bit will enable the debug mode. In this mode, all internal accesses are out-

put as if they were reads or writes to the expansion memory addressed by nCS5. nCS5 will still

be active in its standard address range. In addition, the internal interrupt request and fast inter-

rupt request signals to the ARM720T processor are output on Port E, bits 1 and 2. Note that

these bits must be programmed to be outputs before this functionality can be observed. The

clock to the CPU is output on Port E, Bit 0 to delineate individual accesses. For example, in

debug mode:

nCS5 = nCS5 or internal I/O strobe

PE0 = CLK

PE1 = nIRQ

PE2 = nFIQ

LCDEN: LCD enable bit. Setting this bit enables the LCD controller.

CDENTX: Codec interface enable TX bit. Setting this bit enables the codec interface for data

transmission to an external codec device.

CDENRX: Codec interface enable RX bit. Setting this bit enables the codec interface for data

reception from an external codec device.

Note: Both CDENRX and CDENTX need to be enabled / disabled in tandem, otherwise data may

be lost.

SIREN: HP SIR protocol encoding enable bit. This bit will have no effect if the UART is not

enabled.

16:17

ADCKSEL: Microwire / SPI peripheral clock speed select. This two-bit field selects the frequency

of the ADC sample clock, which is twice the frequency of the synchronous serial ADC interface

clock. The table below shows the available frequencies for operation when in PLL mode. These

bits are also used to select the shift clock frequency for the SSI2 interface when set into master

mode.

EXCKEN: External expansion clock enable. If this bit is set, the EXPCLK is enabled continuously

as a free running clock with the same frequency and phase as the CPU clock, assuming that the

main oscillator is running. This bit should not be left set all the time for power consumption rea-

sons. If the system enters the Standby State, the EXPCLK will become undefined. If this bit is

clear, EXPCLK will be active during memory cycles to expansion slots that have external wait

state generation enabled only.

WAKEDIS: Setting this bit disables waking up (exiting) from the Standby State, from either the

WAKEUP input pin or a keypress after one of the following signals became active: nPWRFL,

BATOK, nEXTPWR.

Note: Even though a keypress will not wake the device, a keypress interrupt will still be generated,

if the keyboard interrupt is not masked, and this can be used to wake the device.

Bit

Description

Table 37. SYSCON1 (Continued)

ADCKSEL

ADC Sample Frequency

(kHz) — SMPCLK

ADC Clock Frequency

(kHz) — ADCCLK

128

256

128

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