s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 331
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s3c4510b
Manufacturer Part Number
s3c4510b
Description
16/32-bit Risc Microcontroller
Manufacturer
Samsung Semiconductor, Inc.
Datasheet
1.S3C4510B.pdf
(422 pages)
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S3C4510B
HDLC BRG TIME CONSTANT REGISTERS (HBRGTC)
The HDLC BRG time constant register value can be changed at any time, but the new value does not take effect
until the next time the constant is loaded into the down counter. No attempt is made to synchronize the loading of
the time constant into HBRGTC while the clock is driving the down counter. For this reason, you should first
disable the baud rate generator before loading the new time constant into the HBRGTC register.
The formula for determining the appropriate time constant for a given baud rate is shown below. The desired rate
is shown in bits per second. This formula shows how the counter decrements from N down to zero-plus-one
cycles for reloading the time constant. This value is then fed to a toggle flip-flop to generate the square wave
output.
BRGOUT1 = (MCLK2 or RXC)/(CNT0 + 1)/(16
BRGOUT2 = BRGOUT1/(1 or 16 or 32 according to CNT2 value of the HBRGTC)
HBRGTCA
HBRGTCB
Registers
31
30
29
28
27
26
25
0x701c
0x801c
Offset
24
Figure 8-21. HDLC BRG Time Constant Register
Table 8-14. HBRGTCA and HBRGTCB Register
23
22
[1:0] Time constant value for CNT2
00 = divide by 1
01 = adivide by 16
10 = divide by 32
[3:2] Time constant value for CNT1
00 = divide by 1
01 = divide by 16
[15:4] Time constant value for CNT0
21 20
R/W
R/W
R/W
19
CNT1
18 17
)
16
HDLC BRG Time Constant Register
HDLC BRG Time Constant Register
15
14
13
12
Description
11
10
CNT0
9
8
7
6
5
4
HDLC CONTROLLERS
CNT1
3
2
Reset Value
0x00000000
0x00000000
CNT2
1
0
8-45
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