C515C_9711 Datasheet, PDF (173/268 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

On-Chip Peripheral Components
C515C
6.5.9 Configuration Examples of a Transmission Object
The microcontroller wishes to configure an object for transmission. It wants to allow automatic
transmission in response to remote frames but does not wish to receive interrupts for this object.
Initialization: The identifier and direction are set up.
Message Control Register
Bit No. MSB
7
6
5
4
3
2
1
0
0
1
0
1
MSGVAL
TXIE
RXIE
0
1
RMTPND
0
1
TXRQ
1
0
CPUUPD
LSB
1
0
0
1
MCR0
INTPND
0
1
NEWDAT
MCR1
CPUUPD is initially set, as the data bytes for the message have not yet been initialized.
Configuration after remote frame received.
Message Control Register
Bit No. MSB
7
6
5
4
1
0
0
1
MSGVAL
TXIE
1
0
RMTPND
1
0
TXRQ
3
2
0
1
RXIE
1
0
CPUUPD
LSB
1
0
0
1
MCR0
INTPND
0
1
NEWDAT
MCR1
After updating the message the microcontroller should clear CPUUPD and set NEWDAT. If the
microcontroller wants to transmit the message it should also set TXRQ, which should otherwise be
left alone.
Semiconductor Group
6-110
1997-11-01