Sci Clock Control Register (Sccr); Sci Clock Control Registers (Sccr - Motorola DSP56303 User Manual

24-bit digital signal processor
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Programming Sheets
Application:
SCI
TCM
RCM
TX Clock
0
0
Internal
0
1
Internal
1
0
External
1
1
External
Transmitter Clock Mode/Source
0 = Internal clock for Transmitter
1 = External clock from SCLK
B-30
RX Clock
SCLK Pin
Internal
Output
Synchronous/Asynchronous
External
Input
Internal
Input
External
Input
Synchronous/Asynchronous
Receiver Clock Mode/Source
0 = Internal clock for Receiver
1 = External clock from SCLK
SCI Clock Prescaler
0 = ÷1 1 = ÷ 8
23
15 14 13 12 11 10
*
TCM RCM
SCP
COD CD11 CD10 CD9
0

SCI Clock Control Register (SCCR)

Reset = $000000
Figure B-19. SCI Clock Control Registers (SCCR)
DSP56303 User's Manual
Mode
CD11–CD0
Asynchronous only
Asynchronous only
Clock Out Divider
0 = Divide clock by 16 before feed to SCLK
1 = Feed clock to directly to SCLK
9
8
7
CD8
CD7
Address X:$FFFF9B Read/Write
Date:
Programmer:
Sheet 2 of 2
Clock Divider Bits (CD11–CD0)
I
Rate
cyc
$000
I
/1
cyc
$001
I
/2
cyc
$002
I
/3
cyc
$FFE
I
/4095
cyc
$FFF
I
/4096
cyc
6
5
4
3
2
CD6
CD5
CD4
CD3
CD2
CD1
*
= Reserved, Program as 0
1
0
CD0

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