參數(shù)資料
型號: SDA5254-2
廠商: SIEMENS A G
元件分類: 圖文
英文描述: ICs for Consumer Electronics
中文描述: TELETEXT DECODER, PDIP52
文件頁數(shù): 94/143頁
文件大?。?/td> 1050K
代理商: SDA5254-2
SDA 525x
Semiconductor Group
94
1998-04-08
6.3.10.2
The baud rate in mode 0 is fixed:
Baud Rates
The baud rate in mode 2 depends on the value of bit SMOD in special function register
PCON (bit 7). If SMOD = 0 (which is the value on reset), the baud rate is 1/32 of the
oscillator frequency. If SMOD = 1, the baud rate is 1/16 of the oscillator frequency.
The baud rates in modes 1 and 3 are determined by the timer 1 overflow rate or can be
generated by the internal baud rate generator.
When timer 1 is used as the baud rate generator, the baud rates in modes 1 and 3 are
determined by the timer 1 overflow rate and the value of SMOD as follows:
The timer 1 interrupt should be disabled in this application. The timer itself can be
configured for either “timer” or “counter” operation, and in any of the 3 running modes.
In the most typical applications, it is configured for “timer” operation, in the auto-reload
mode (high nibble of TMOD = 0010B). In that case, the baud rate is given by the formula:
One can achieve very low baud rates with timer 1 by leaving the timer 1 interrupt
enabled, configuring the timer to run as a 16-bit timer (high nibble of TMOD = 0001B),
and using the timer 1 interrupt to do a 16-bit software reload.
Mode 0 baud rate
f
6
--------------
=
Mode 2 baud rate
2
------------------
SMOD
32
f
OSC
×
=
Mode 1, 3 baud rate
2
------------------
SMOD
16
Time 1 overflow
×
=
Mode 1, 3 baud rate
2
------------------
SMOD
f
OSC
D
)
---------------------------------------------
×
=
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