p87c591vfb NXP Semiconductors, p87c591vfb Datasheet - Page 55

• Manufacturer Part Number: p87c591vfb
• Description: Single-chip 8-bit Microcontroller With Can Controller
• Manufacturer: NXP Semiconductors

Philips Semiconductors
12.5.18 T
The global layout of the Transmit Buffer is shown in Fig.19.
One has to distinguish between the Standard Frame
Format (SFF) and the Extended Frame Format (EFF)
configuration. The transmit buffer allows the definition of
one transmit message with up to eight data bytes.
2000 Jul 26
handbook, full pagewidth
Single-chip 8-bit microcontroller with CAN controller
CAN Address
RANSMIT
Fig.19 Transmit Buffer Layout for Standard and Extended Frame Format configurations.
B
UFFER
Standard Frame Format (SFF)
112
113
114
115
116
117
118
119
120
121
122
123
124
TX Frame information
TX Identifier 1
TX Identifier 2
TX Data byte 1
TX Data byte 2
TX Data byte 3
TX Data byte 4
TX Data byte 5
TX Data byte 6
TX Data byte 7
TX Data byte 8
unused
unused
CAN Address
55
12.5.18.1 Transmit Buffer Layout
It is subdivided into Descriptor and Data Field where the
first byte of the Descriptor Field is the Frame Information
Byte (Frame Info). It describes the Frame Format (SFF or
EFF), Remote or Data Frame and the Data Length. Two
identifier bytes for SFF and four bytes for EFF messages
follow. The Data Field contains up to eight data bytes. The
Transmit Buffer has a length of 13 bytes and is located in
the CAN address range from 112 to 124.
Extended Frame Format (EFF)
112
113
114
115
116
117
118
119
120
121
122
123
124
TX Frame information
TX Identifier 1
TX Identifier 2
TX Identifier 3
TX Identifier 4
TX Data byte 1
TX Data byte 2
TX Data byte 3
TX Data byte 4
TX Data byte 5
TX Data byte 6
TX Data byte 7
TX Data byte 8
MHI023
Preliminary Specification
P8xC591