Motorola DSP56309 User Manual page 235

Serial Communication Interface (SCI)
Operating Modes
Register
Bit Mnemonic
Bit
SCCR
CD[11:0]
SRX SRX [23:0]
STX STX[23:0]
SRSH SRS[8:0]
STSH STS[8:0]
Note: SRSHÑSCI Receive Shift Register, STSH Ñ SCI Transmit Shift Register
HWÑHardware reset is caused by asserting the external RESET signal.
SWÑSoftware reset is caused by executing the RESET instruction.
IRÑIndividual reset is caused by clearing PCRE (bits 0Ð2) (configured for
STÑStop reset is caused by executing the STOP instruction.
1ÑThe bit is set during this reset.
0ÑThe bit is cleared during this reset.
Ñ Ñ The bit is not changed during this reset
8.4.2 SCI Initialization
The correct way to initialize the SCI is as follows:
1. Send a hardware RESET signal or software RESET instruction.
2. Program SCI control registers.
3. Configure at least one SCI signal as other than GPIO.
8-24
Table 8-3 SCI Registers after Reset (Continued)
Bit Number
TRNE
TCM 15
RCM 14
SCP 13
COD 12
11Ð0
23Ð16, 15Ð8, 7Ð0
23Ð0
8Ð0
8Ð0
DSP56309UM/D
HW
Reset
0 1
0
0
0
0
0
Ñ
Ñ
Ñ
Ñ
Reset Type
SW IR
Reset Reset Reset
1 1
0 Ñ
0 Ñ
0 Ñ
0 Ñ
0 Ñ
Ñ Ñ
Ñ Ñ
Ñ Ñ
Ñ Ñ
GPIO
).
MOTOROLA
ST
1
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ð