![](http://datasheet.mmic.net.cn/30000/MC68EN360FE33_datasheet_2368935/MC68EN360FE33_606.png)
Serial Management Controllers (SMCs)
7-282
MC68360 USER’S MANUAL
Bits 15, 7, 6—Reserved
These bits should be cleared by the user.
CLEN—Character Length
The CLEN value should be programmed with the total number of bits in the character mi-
nus one. The total number of bits in the character is calculated as the sum of: 1 (start bit
always present) + number of data bits (5–14) + number of parity bits (0 or 1) + number of
stop bits (1 or 2).
Example: For 8 data bits, no parity, and 1 stop bit, the total number of bits in the character
is 1 + 8 + 0 + 1 = 10. Thus, CLEN should be programmed to 9.
The number of data bits in the character may range from 5 to 14 bits. If the data bit length
is less than 8 bits, the MSBs of each byte in memory are not used on transmit and are
written with zeros on receive. If the data bit length is more than 8 bits, the MSBs of each
16-bit word in memory are not used on transmit and are written with zeros on receive.
NOTES
The total number of bits in the character must never exceed 16.
Thus, if a 14-bit data length is chosen, SL must be set to one
stop bit, and parity should not be enabled. If a 13-bit data length
is chosen and parity is enabled, SL must be set to one stop bit.
The values 0 to 3 should not be written to CLEN, or erratic be-
havior may result.
SL—Stop Length
0 = One stop bit
1 = Two stop bits
PEN—Parity Enable
0 = No parity
1 = Parity is enabled for the transmitter and receiver as determined by the PM bit.
PM—Parity Mode
0 = Odd parity
1 = Even parity
SM—SMC Mode
00 = GCI or SCIT support
01 = Reserved
10 = UART (must be selected for SMC UART operation)
11 = Totally transparent operation
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
..
.