SAE 81C90/91
07Feb95@09:05h Intermediate Version
Baud Rate Prescaler Register
The register is not readable and can only be written when bit IM (MOD.0) is set.
BRPR
7
–
-
6
–
-
5
4
3
2
1
0
Address: 03
BRP
H
Reset Value: 00
w
w
w
w
w
w
H
Bit(field)
BRP
Function
Baud Rate Prescaler
This prescaler determines the period of the system clock:
SCL = (BRP + 1) × 2 × tOSC, where tOSC = 1 / f
t
.
crystal
Note: Not defined bit positions must be ’0’ for write accesses.
The bit length tBL is computed as follows:
tBL = tTSeg1 + tTSeg2 + 1 tSCL
The baudrate BR can be computed with the following formula:
BR = f
/ (2 x (BRP + 1) x (TS1 + TS2 + 3) )
crystal
Note: BRP
TS1
see Baud Rate Prescaler Register
see Bit Length Register 1
TS2
see Bit Length Register 1
Semiconductor Group
24
INFINEON [ Infineon ]
