P80C592 Philips Semiconductors, P80C592 Datasheet - Page 35

• Manufacturer Part Number: P80C592
• Description: 8-bit microcontroller with on-chip CAN
• Manufacturer: Philips Semiconductors

Philips Semiconductors
13.5.4
A command bit initiates an action within the transfer layer of the CAN-controller. The Command Register appears to the
CPU as a read/write memory, except for the bits CMR.0 (TR) to CMR.3 (COS), which return a HIGH if being read.
Table 33 Command Register (address 1)
Table 34 Description of the CMR bits
1996 Jun 27
BIT SYMBOL
7
6
5
4
3
2
1
0
8-bit microcontroller with on-chip CAN
RX0A
RX0A
RX1A
WUM
SLP
COS
RRB
AT
TR
7
C
OMMAND
RX0 Active. See Table 35; note 1.
RX1 Active. See Table 35; note 1.
Wake-up Mode (note 2). If the value of WUM is:
Sleep (note 3). If the value of SLP is:
Clear Overrun Status (note 4). If the value of COS is:
Release Receive Buffer (note 5). If the value of RRB is:
Abort Transmission (note 6). If the value of AT is:
Transmission Request (note 7). If the value of TR is:
RX1A
R
HIGH (single ended), then the difference of the RX signals to the internal reference voltage
is used for wake up.
LOW (differential), then the differential signal between RX0 and RX1 is used for wake up.
HIGH (sleep), then the CAN-controller enters sleep mode if no CAN interrupt is pending and there
is no bus activity.
LOW (wake up), then the CAN-controller functions normally.
HIGH (clear), then the Data Overrun status bit is set to LOW (see Table 37).
LOW (no action), then there is no action.
HIGH (released), then the Receive Buffer attached to the CPU is released.
LOW (no action), then there is no action.
HIGH (present) and if not already in progress, a pending Transmission Request is cancelled.
LOW (absent), then there is no action.
HIGH (present), then a message shall be transmitted.
LOW (absent), then there is no action.
EGISTER
6
(CMR)
WUM
5
SLP
4
35
FUNCTION
COS
3
RRB
2
AT
1
Product specification
P8xC592
1
TR
0
2
AV
DD