st10f269z1 STMicroelectronics, st10f269z1 Datasheet - Page 102

• Manufacturer Part Number: st10f269z1
• Description: St10f269 16-bit Mcu With Mac Unit, 256k Byte Flash Memory And 12k Byte Ram
• Manufacturer: STMicroelectronics

14 - SERIAL CHANNELS
Baud Rate Generation
The Baud rate generator is clocked by f
timer is counting downwards and can be started
or stopped through the global enable bit SSCEN
in register SSCCON. Register SSCBR is the
dual-function
register. Reading SSCBR, while the SSC is
enabled, returns the content of the timer. Reading
SSCBR, while the SSC is disabled, returns the
programmed reload value. In this mode the
desired reload value can be written to SSCBR.
Note
The formulas below calculate the resulting Baud
rate for a given reload value and the required
reload value for a given Baud rate:
(SSCBR) represents the content of the reload
register, taken as unsigned 16-bit integer.
Table 32 lists some possible Baud rates against
the required reload values and the resulting bit
times for a 40MHz CPU clock.
Table 32 : Synchronous Baud Rate and Reload
Values (PQFP144 devices)
Table 33 lists some possible Baud rates against
the required reload values and the resulting bit
times for a 32MHz CPU clock.
102/184
Reserved use a
reload value > 0.
10M Baud
5M Baud
2.5M Baud
1M Baud
100K Baud
10K Baud
1K Baud
306 Baud
Baud Rate
Baud rate
SSCBR = (
Never write to SSCBR, while the SSC is
enabled.
SSC
Baud
=
2 x Baud rate
Bit Time
3.26ms
100ns
200ns
400ns
100 s
2 x [(SSCBR) + 1]
10 s
1ms
1 s
---
Rate
f
CPU
f
CPU
Generator/Reload
SSC
Reload Value
) - 1
07CFh
FF4Eh
00C7h
4E1Fh
0001h
0003h
0007h
0013h
CPU
---
/2. The
.
Table 33 : Synchronous Baud Rate and Reload
Values (TQFP144 devices)
reload value > 0.
Reserved use a
244.14 Baud
Baud Rate
500KBaud
100KBaud
10KBaud
1K Baud
8MBaud
4MBaud
2MBaud
1MBaud
Bit Time
5.24ms
125ns
250ns
500ns
100 s
10 s
1ms
1 s
2 s
---
Reload Value
ST10F269
FFFFh
030Ch
3E7Fh
0001h
0003h
0007h
000Fh
001Fh
009Fh
---