GMS30C7201 Datasheet, PDF (289/352 Pages) Hynix Semiconductor – 60MHz operation frequency Low power consumption

Slow AMBA Peripherals
RVR (Reference Value Register) is an 11-bit read-only register which is used to indicate the
value of RING input, the difference of read pointer position from write pointer position in the
FIFO for transmit/receive.
Bit
Name
Function
10
UARTRING
This bit shows the state of the ring signal to the UART
block.
9
TxFifoFull
When the transmit FIFO is full, this bit is set. When FIFO is
full, TxPosi and RxPosi values are zero.
8
RINGIV
RING input value
7:4
TXPD
Difference of read/write pointer for TX FIFO (bits 3:0)
3:0
RXPD
Difference of read/write pointer for RX FIFO (bits 3:0)
Table 13-44: RVR bit functions
SR (Status Register) is a 3-bit read-only register which is used to indicate the status of the AFE
interface. These bits show the interrupt sources regardless of interrupt disable.
Bit
Name
2
RINGI
1
FEMPTY
0
TXR
Function
RING interrupt
0 : No interrupt detected (initial value)
1 : Interrupt occurred
FIFO empty (active HIGH) interrupt
0 : No interrupt detected (initial value)
1 : Interrupt occurred
TX error (active HIGH) interrupt
0 : No interrupt detected (initial value)
1 : Interrupt occurred
Table 13-45: SR bit functions
UARTCR (UART Control Register) is a 1-bit read/write register, which controls RING signal
to UART block.
Bit
Name
0
RINGEN
Function
Enable RING to UART
0 : RING signal is connected to UART nRI
1 : disable mode (initial value)
In this mode, RING signal to UART is always HIGH.
Table 13-46: UARTCR bit functions
GMS30C7201 Data Sheet
13-61