MC908GZ60CFUE Datasheet, PDF (213/352 Pages) Freescale Semiconductor, Inc – Standard features, Features of the CPU08

I/O Registers
LINR — LIN Receiver Bits
This read/write bit selects the enhanced ESCI features for the local interconnect network (LIN) protocol
as shown in Table 14-6. Reset clears LINR.
Table 14-6. ESCI LIN Control Bits
LINT
0
0
0
1
1
1
1
LINR
0
1
1
0
0
1
1
M
Functionality
X Normal ESCI functionality
0 11-bit break detect enabled for LIN receiver
1 12-bit break detect enabled for LIN receiver
0 13-bit generation enabled for LIN transmitter
1 14-bit generation enabled for LIN transmitter
0 11-bit break detect/13-bit generation enabled for LIN
1 12-bit break detect/14-bit generation enabled for LIN
In LIN (version 1.2) systems, the master node transmits a break character which will appear as
11.05–14.95 dominant bits to the slave node. A data character of 0x00 sent from the master might
appear as 7.65–10.35 dominant bit times. This is due to the oscillator tolerance requirement that the
slave node must be within ±15% of the master node's oscillator. Since a slave node cannot know if it
is running faster or slower than the master node (prior to synchronization), the LINR bit allows the slave
node to differentiate between a 0x00 character of 10.35 bits and a break character of 11.05 bits. The
break symbol length must be verified in software in any case, but the LINR bit serves as a filter,
preventing false detections of break characters that are really 0x00 data characters.
SCP1 and SCP0 — ESCI Baud Rate Register Prescaler Bits
These read/write bits select the baud rate register prescaler divisor as shown in Table 14-7. Reset
clears SCP1 and SCP0.
Table 14-7. ESCI Baud Rate Prescaling
SCP[1:0]
00
01
10
11
Baud Rate Register
Prescaler Divisor (BPD)
1
3
4
13
SCR2–SCR0 — ESCI Baud Rate Select Bits
These read/write bits select the ESCI baud rate divisor as shown in Table 14-8. Reset clears
SCR2–SCR0.
Table 14-8. ESCI Baud Rate Selection
SCR[2:1:0]
000
001
010
011
100
101
110
111
Baud Rate Divisor (BD)
1
2
4
8
16
32
64
128
MC68HC908GZ60 • MC68HC908GZ48 • MC68HC908GZ32 Data Sheet, Rev. 6
Freescale Semiconductor
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