UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 536

• Manufacturer Part Number: UPD78F0838
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

534
<8> Interframe space
R
D
(a) Error active node
(b) Error passive node
The interframe space consists of a 3-bit intermission field and a bus idle field.
The interframe space consists of an intermission field, a suspend transmission field, and a bus idle field.
Usually, the intermission field is 3 bits. If the transmitting node detects a dominant level at the third bit of
the intermission field, however, it executes transmission.
The interframe space is inserted after a data frame, remote frame, error frame, or overload frame to
separate one frame from the next.
- The bus state differs depending on the error status.
Remarks 1. Bus idle: State in which the bus is not used by any node.
Remarks 1. Bus idle:
(Frame)
R
D
2. D: Dominant = 0
2. D: Dominant = 0
R: Recessive = 1
Suspend transmission: Sequence of 8 recessive-level bits transmitted from the node in the
R: Recessive = 1
(Frame)
Intermission
Figure 15-14. Interframe Space (Error Passive Node)
Figure 15-13. Interframe Space (Error Active Node)
(3 bits)
Preliminary User’s Manual U19748EJ1V0UD
CHAPTER 15 CAN CONTROLLER
Intermission
(3 bits)
Interframe space
State in which the bus is not used by any node.
error passive status.
Suspend transmission
Interframe space
(8 bits)
(0 to
Bus idle
bits)
(0 to
Bus idle
(Frame)
bits)
(Frame)