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SCI Registers
601
SPRUI07–March 2020
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Serial Communications Interface (SCI)
10.14.2.3 SCIHBAUD Register (Offset = 2h) [reset = 0h]
SCIHBAUD is shown in Figure 10-13 and described in Table 10-9.
Return to the Summary Table.
The values in SCIHBAUD and SCILBAUD specify the baud rate for the SCI.
Figure 10-13. SCIHBAUD Register
15 14 13 12 11 10 9 8
RESERVED
R-0h
7 6 5 4 3 2 1 0
BAUD
R/W-0h
Table 10-9. SCIHBAUD Register Field Descriptions
Bit Field Type Reset Description
15-8 RESERVED R 0h
Reserved
7-0 BAUD R/W 0h
SCI 16-bit baud selection Registers SCIHBAUD (MSbyte).
The internally-generated serial clock is determined by the low speed
peripheral clock (LSPCLK) signal and the two baud-select registers.
The SCI uses the 16-bit value of these registers to select one of 64K
serial clock rates for the communication modes.
BRR = (SCIHBAUD << 8) + (SCILBAUD)
The SCI baud rate is calculated using the following equation:
SCI Asynchronous Baud = LSPCLK / ((BRR + 1) *8)
Alternatively,
BRR = LSPCLK / (SCI Asynchronous Baud * 8) - 1
Note that the above formulas are applicable only when 0 < BRR <
65536. If BRR = 0, then
SCI Asynchronous Baud = LSPCLK / 16
Where: BRR = the 16-bit value (in decimal) in the baud-select
registers
Reset type: SYSRSn
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