XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 507

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

27.6.1 Protocol Architecture
27.6.2 Rx and Tx Shift Registers
MC68HC908AZ60A — Rev 2.0
MOTOROLA
The protocol handler contains the state machine, Rx shadow register, Tx
shadow register, Rx shift register, Tx shift register, and loopback
multiplexer as shown in
The Rx shift register gathers received serial data bits from the J1850 bus
and makes them available in parallel form to the Rx shadow register. The
Tx shift register takes data, in parallel form, from the Tx shadow register
and presents it serially to the state machine so that it can be transmitted
onto the J1850 bus.
DLOOP FROM BCR2
LOOPBACK CONTROL
Byte Data Link Controller (BDLC)
Figure 27-13. BDLC Protocol Handler Outline
Rx SHADOW REGISTER
Figure
Rx SHIFT REGISTER
BDRxD
MULTIPLEXER
LOOPBACK
TO CPU INTERFACE AND Rx/Tx BUFFERS
8
27-13.
TO PHYSICAL INTERFACE
STATE MACHINE
BDTxD
Byte Data Link Controller (BDLC)
Tx SHADOW REGISTER
Tx SHIFT REGISTER
BDLC Protocol Handler
8
Technical Data
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