Freescale Semiconductor MCF5480 - Manual (Page 812)

MCF548x Reference Manual, Rev. 3
26-50 Freescale Semiconductor
26.7.2.2 Modem8 Mode
Applying the clock to the PSCBCLK input and programming the control registers are required to initialize
in modem8 mode. The following table describes a sample initialization sequence.
9 PSCRFCR 0F WRITE TAG = 00 Not EOF
FRMEN=1 Enable frame mode
GR[2:0]=100 Granularity is 4 byte
10 PSCTFCR 0F WRITE TAG = 00 Not EOF
FRMEN=1 Enable frame mode
GR[2:0]=100 Granularity is 16 byte
11 PSCRFAR 00F0 ALARM[8:0]=0F0 Request is asserted if # of data >= 240
12 PSCTFAR 00F0 ALARM[8:0]=0F0 Request is asserted if # of empty >= 240
13 PSCOPSET 01 RES=0 Bit is always 0.
RTS=1 Assert RTS (PSCnRTS=0)
14 PSCCR 05 TC=01 Enable transmitter
RC=01 Enable receiver
Table 26-42. Sample Initialization Sequence for Modem8 Mode
Step
No.
Register Value Details Meaning
1 PSCSICR 01 DTS1=0 The 1st bit is in the rising edge of sync
SHDIR=0 MSB first
SIM[2:0]=001 modem8 mode
2 PSCCR 20 MISC=010 Reset receiver and RxFIFO
30 MISC=011 Reset transmitter and TxFIFO
40 MISC=100 Reset all error status
3 PSCIMR 0300 IPC=0 Disable input port change interrupt
RxRDY or FU=1 Enable receiver interrupt/request
TxRDY=1 Enable transmitter interrupt/request
4 PSCRFCR 0F WRITE TAG=00 Not EOF
FRMEN=1 Enable frame mode
GR[2:0]=100 Granularity is 4 byte
Table 26-41. Sample Initialization Sequence for UART Mode (Continued)
Step
No.
Register Value Details Meaning