SAB80C515A-5 SIEMENS [Siemens Semiconductor Group], SAB80C515A-5 Datasheet - Page 41
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SAB80C515A-5
Manufacturer Part Number
SAB80C515A-5
Description
8-Bit CMOS Single-Chip Microcontroller Family
Manufacturer
SIEMENS [Siemens Semiconductor Group]
Datasheet
1.SAB80C515A-5.pdf
(108 pages)
- Current page: 41 of 108
- Download datasheet (2Mb)
On-Chip Peripheral Components
5.2
New Baud Rate Generator for Serial Channel
The Serial Channel has a new baud rate generator which provides greater flexibility and better
resolution. It substitutes the 80C515’s baud rate generator at the Serial Channel which provides
only 4.8 kBaud or 9.6 kBaud at 12 MHz crystal frequency. Since the new generator offers greater
flexibility it is often possible to use it instead of Timer1 which is then free for other tasks.
Figure 5-3 shows a block diagram of the new baud rate generator for the Serial Channel. It consists
f
of a free running 10-bit timer with
/ 2 input frequency. On overflow of this timer there is an
OSC
automatic reload from the registers SRELL (address AA H ) and SRELH (address BA H ). The lower
8 bits of the timer are reloaded from SRELL, while the upper two bits are reloaded from bit 0 and 1
of register SRELH. The baud rate timer is reloaded by writing to SRELL.
Figure 5-4
Baud Rate Generator for the Serial Interface
Semiconductor Group
5-8
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