UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 479

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

Internally, the local node recognizes that it has transmitted ACK. An overload frame cannot be transmitted to the CAN
bus.
16.13.2 Single-shot mode
CAN protocol, a message frame transmission that has been aborted by either arbitration loss or error occurrence has
to be repeated without control by software.). All other behavior of single shot mode is identical to normal operation
mode. Features of single shot mode can not be used in combination with normal mode with ABT.
setting of the AL bit of the C0CTRL register. When the AL bit is cleared to 0, re-transmission upon arbitration loss and
upon error occurrence is disabled. If the AL bit is set to 1, re-transmission upon error occurrence is disabled, but re-
transmission upon arbitration loss is enabled. As a consequence, the TRQ bit in a message buffer defined as a
transmit message buffer is cleared to 0 by the following events.
the C0INTS register respectively, and the type of the error can be identified by reading the LEC[2:0] bits of the C0LEC
register.
register is set to 1. If the CIE0 bit of the C0IE register is set to 1 at this time, an interrupt request signal is output.
Furthermore, ACK is not returned to the CAN bus in this mode upon the valid reception of a message frame.
In the single-shot mode, automatic re-transmission as defined in the CAN protocol is switched off (According to the
The single-shot mode disables the re-transmission of an aborted message frame transmission according to the
- Successful transmission of the message frame
- Arbitration loss while sending the message frame
- Error occurrence while sending the message frame
The events arbitration loss and error occurrence can be distinguished by checking the CINTS4 and CINTS3 bits of
Upon successful transmission of the message frame, the transmit completion interrupt bit CINTS0 of the C0INTS
The single-shot mode can be used when emulating time-triggered communication methods (e.g. TTCAN level 1).
Caution The AL bit is only valid in Single-shot mode. It does not influence the operation of re-
Caution If only two CAN nodes are connected to the CAN bus and one of them is operating in the
transmission upon arbitration loss in the other operation modes.
receive-only mode, there is no ACK on the CAN bus. Due to the missing ACK, the transmitting
node will transmit an active error flag, and repeat transmitting a message frame.
transmitting node becomes error passive after transmitting the message frame 16 times
(assuming that the error counter was 0 in the beginning and no other errors have occurred).
After the message frame for the 17th time is transmitted, the transmitting node generates a
passive error flag. The receiving node in the receive-only mode detects the first valid message
frame at this point, and the VALID bit is set to 1 for the first time.
CHAPTER 16 CAN CONTROLLER
User’s Manual U17554EJ4V0UD
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