Cirrus-logic EP73xx Manual de usuario descargar pdf (Pagina 72)

5-12 EP7309/11/12 User’s Manual - DS508UM4

System Registers

System Flag Register 2 (SYSFLG2)

Address: 0x8000.1140, Read Only

Definition: The SYSFLG2 system flag register is a 32-bit read only register. It

providesinformationregarding thestatusofthe CPU and associated

peripherals.

Bit Descriptions:

SS2RXOF: Master/slave SSI2 RX FIFO overflow. This bit is set when a write

is attempted to a full RX FIFO (i.e., when RX is still receiving data

and the FIFO is full). This can be cleared in one oftwo ways:

1) Empty the FIFO (remove data from FIFO) and then

write to

SRXEOF location.

2) Disable the RX (affects of disabling the RX will not take

place until a full SSI2 clock cycle after it is disabled)

RESVAL: Master/slave SSI2 RX FIFO residual byte present, cleared by

popping the residual byte into the SSI2 RX FIFO or by a new RX

frame sync pulse.

RESFRM: Master/slave SSI2 RX FIFO residual byte present, cleared only by

anewRXframesyncpulse.

SS2RXFE: Master/slave SSI2 RX FIFO empty bit. This will be set if the

16 x 16 RX FIFO is empty.

SS2TXFF: Master/slave SSI2 TX FIFO full bit. This will be set if the 16 x 16

TX FIFO is full. This will get cleared when data is removed from

the FIFO or the EP73xx is reset.

SS2TXUF: Master/slave SSI2 TX FIFO Underflow bit. This will be set if there

is attempt to transmit when TX FIFO is empty. This will be cleared

when FIFO gets loaded with data.

CKMODE: This bit reflects the status of the

CLKSEL (PE[2])input,latched

during

nPOR. When low, the PLL is running and the chip is

operating in 18.432–73.728 MHz mode. When high the chip is

operating from an external 13 MHz clock.

UBUSY2: UART2 transmitter busy. This bit is set while UART2 is busy

transmitting data; it is guaranteed to remain set untilthe complete

byte has been sent, including all stop bits.

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

RSVD UTXFF2 URXFE2 RSVD

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

RSVD UBUSY

RSVD CKMOD

SS2TXU

SS2TXF

SS2RXF

RESFR

RESVAL SS2RX

1 2 ... 67 68 69 70 71 72 73 74 75 76 77 ... 157 158

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Cirrus-logic EP73xx Manual de usuario Pagina 72

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