
Data Sheet
119
Rev. 1.0, 2005-06-02
OctalLIUTM
PEF 22508 E
Register DescriptionClock Mode Register 2
DCF
4
rw
DCO-R Center- Frequency Disabled
0B
, The DCO-R circuitry is frequency centered in master mode if no
2.048 MHz reference clock on pin SYNC is provided or in slave
mode if a loss-of-signal occurs in combination with no 2.048 MHz
clock on pin SYNC or a gapped clock is provided on pin RCLKI and
this clock is inactive or stopped.
1B
, The center function of the DCO-R circuitry is disabled. The
generated clock (DCO-R) is frequency frozen in that moment when
no clock is available on pin SYNC or pin RCLKI. The DCO-R
circuitry starts synchronization as soon as a clock appears on pins
SYNC or RCLKI.
IRSP
3
rw
Internal Receive System Frame Sync Pulse
Note: Recommendation: This bit should be set to 1.
0B
, The frame sync pulse is derived from RDOP output signal
internally (free running).
1B
, The frame sync pulse for the receive system interface is internally
sourced by the DCO-R circuitry. This internally generated frame
sync signal can be output (active low) on multifunction ports RP(A
to D) (RPC(3:0) = 0001H).
IRSC
2
rw
Internal Receive Digital (Framer) Clock
0B
, The working clock for the receive framer interface is sourced by
FCLKR or in receive elastic buffer bypass mode from the
corresponding extracted receive clock RCLK.
1B
, The working clock for the receive framer interface is sourced
internally by DCO-R or in bypass mode by the extracted receive
clock. FCLKR is ignored.
IXSC
0
rw
Internal Transmit Digital (Framer) Clock
0B
, The working clock for the transmit framer interface is sourced by
FCLKX.
1B
, The working clock for the transmit framer interface is sourced
internally by the working clock of the receive framer interface.
FCLKX is ignored.
Field
Bits
Type
Description