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參數(shù)資料
| 型號(hào)： | AM8530 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | Serial Communications Controller |
| 中文描述： | 串行通信控制器 |
| 文件頁(yè)數(shù)： | 158/194頁(yè) |
| 文件大?。?/td> | 797K |
| 代理商： | AM8530 |
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SCC Application Notes
AMD
7–9
Table 7–4. Polled Asynchronous Initialization Procedure
Register
WR9
WR4
WR3
WR5
WR9
WR10
WR11
WR12
WR13
WR14
Enables
WR14
WR3
WR5
Value
C0H
4CH
C0H
60H
00H
00H
56H
06H
00H
10H
Comments
Force Hardware Reset
x16 clock, 2 stop bits, no parity
Rx 8 bits, Rx disabled
Tx 8 bits, DTR, RTS, Tx off
Int. Disabled
NRZ
Tx & Rx = BRG out, TRxC = BRG out
Time constant = 6
Time constant high = 0
BRG in =
RTxC
, BRG off, loopback
11H
C1H
68H
BRG enable
Rx enable
Tx enable
7.2.3.1
WR9
resets the SCC to a known state by writing a C0 hex. The Force Hardware Reset
command is identical to a hardware reset. It will reset both channels.
S CC Operating Mode Programming
WR4
selects the Asynchronous, x 16 mode, with 2 stop bits and no parity. The x 16 mode
means that clock rate is 16 times the data rate.
WR3
selects 8 bits per character and does not enable the receive. The 8 bits per charac-
ter allows 8 bits to be assembled from the data stream. The receiver is not enabled at this
time because the SCC has not been initialized.
WR5
selects 8 bits per character and does not enable the transmitter. The 8 bits per char-
acter allows 8 bits to be sent, as data, with the least significant bit first. The transmitter is
not enabled at this time because the SCC has not been initialized.
WR9
selects that there are no interrupts enabled. This inhibits the SCC from requesting
an interrupt from the CPU.
WR10
selects NRZ encoding. This NRZ coding is used on the transmitter as well as the
receiver.
WR11
selects the
RTxC
pin to TTL clock; the baud-rate generator is the transmit and re-
ceive clocks source, and the
TRxC
pin is used as a baud-rate generator output.
WR12
&
WR13
select the baud-rate generator’s time constant. The WR13 time constant
is determined by the equation:
Time Constant =
Clock Frequency
2 x Baud Rate x clock mode
–2
In this example, the clock frequency is 2.4576 MHz, the baud rate is 9600, the clock
mode is 16. The time constant is, therefore, 6; expressed as a 16-bit, hexadecimal num-
ber, it is 0006H. The time constant Low (WR12) is, therefore 06H and the time constant
High (WR13) is 00H. The baud rate for this example can be varied, as long as the data
rate is less than
1
/
4
of the PCLK rate. Table 7–5 shows the time constants for other com-
mon baud rates.
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相關(guān)代理商/技術(shù)參數(shù) |
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| AM8530ADC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Communications Controller |
| AM8530ADCB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Communications Controller |
| AM8530AJC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Communications Controller |
| AM8530APC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Communications Controller |
| AM8530DC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Communications Controller |
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