r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 1091

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

21.3.8
SCBRR is an 8-bit register that sets the serial transmission/reception bit rate in accordance with
the baud rate generator operating clock selected by the CKS1 and CKS0 bits in SCSMR.
SCBRR can always be read from and written to by the CPU.
The SCBRR setting is found from the following equation.
Asynchronous mode:
Clocked synchronous mode:
Where B:
Table 21.3 SCSMR Settings
The bit rate error in asynchronous mode is found from the following equation:
n
0
1
2
3
N:
Pck: Peripheral module operating frequency (MHz)
n:
N =
N =
Error (%) =
Bit Rate Register n (SCBRR)
Bit rate (bit/s)
SCBRR setting for baud rate generator (0 ≤ N ≤ 255)
0, 1, 2, 3
(See table 21.3 for the relation between n and the baud rate generator input clock.)
Baud Rate Generator Input Clock
Pck
Pck/4
Pck/16
Pck/64
64 × 2
8 × 2
Pck
Pck
2n - 1
2n - 1
(N + 1) × B × 64 × 2
× B
× B
Pck × 10
× 10
× 10
6
6
6
- 1
- 1
2n - 1
- 1
21. Serial Communication Interface with FIFO (SCIF)
CKS1
0
0
1
1
× 100
Rev.1.00 Jan. 10, 2008 Page 1061 of 1658
SCSMR Setting
CKS0
0
1
0
1
REJ09B0261-0100