DS80C390_00 Datasheet, PDF (67/155 Pages) Dallas Semiconductor – High-Speed Microcontroller User’s Guide Supplement

DS80C390 High-Speed Microcontroller User’s Guide Supplement
Clock Output Register (COR)
7
6
5
4
3
2
1
0
SFR CEh IRDACK C1BPR7 C1BPR6 C0BPR7 C0BPR6 COD1 COD0 CLKOE
RT-0 RT-0
RT-0
RT-0
RT-0
RT-0
RT-0
RT-0
R=Unrestricted Read, T=Timed Access Write Only, -n=Value after Reset
IRDACK
Bit 7
C1BPR7, C1BPR6
Bit 6-5
IRDA Clock Output Enable. When IRDACK is set to 1, the Clock Output Pad
will issue a clock that is 16 times the programmed baud rate associated with
Serial Port 0. When IRDACK is cleared to a 0, the Clock Output Pad will be
controlled by the CLKOE bit in COR.0 and the associated clock supplied by the
Clock Output Divide Bits (COR.1 and COR.2) when enabled by the CLKOE bit.
Note that the appropriate baud rate must be established via the use of Timer 1,
programmed for the baud rate generator Mode 2.
CAN 1 Baud Rate Prescaler Bits. These bits establish bits 7 and 6 of the eight-
bit CAN 1 Baud Rate Pre-scaler. These bits can not be modified while the
SWINT bit in the CAN1 Control Register is cleared to 0. The remaining six bits
are located in the CAN 1 Bus Timing Register Zero (C1BT0) located in the CAN
MOVX memory.
C0BPR7, C0BPR6
Bit 4-3
COD1, COD0
Bit 2-1
CAN 0 Baud Rate Prescaler Bits. These bits establish bits 7 and 6 of the eight-
bit CAN 0 Baud Rate Pre-scaler. These bits can not be modified while the
SWINT bit in the CAN 0 Control Register is cleared to 0. The remaining six bits
are located in the CAN 0 Bus Timing Register Zero (C0BT0) located in the CAN
MOVX memory.
Clock Output Divide Select bits. These bits select the output frequency of the
CLKO function on port pin P3.5.
COD1
COD0 P3.5 Output Frequency
0
0
System clock divided by 2
0
1
System clock divided by 4
1
0
System clock divided by 6
1
1
System clock divided by 8
XCLKOE
Bit 0
External Clock Output Enable. When XCLKOE=1, port pin P3.5 asserts a
clock signal of the frequency defined by COD1, COD2. When XCLKOE=0, port
pin P3.5 functions as a general purpose I/O or as the T1 alternate function.
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