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For example, the receive errors for the following conditions are calculated:
Baud rate = 2400
BRCLK =
UxBR =
UxMCTL =
Start bit Error [%] + baud rate
BRCLK
Data bit D0 Error [%] + baud rate
BRCLK
Data bit D1 Error [%] + baud rate
BRCLK
Data bit D2 Error [%] + baud rate
BRCLK
Data bit D3 Error [%] + baud rate
BRCLK
Data bit D4 Error [%] + baud rate
BRCLK
Data bit D5 Error [%] + baud rate
BRCLK
Data bit D6 Error [%] + baud rate
BRCLK
Data bit D7 Error [%] + baud rate
BRCLK
Parity bit Error [%] + baud rate
BRCLK
Stop bit 1 Error [%] + baud rate
BRCLK
The results show the maximum per-bit error to be 5.08% of a BITCLK period.
32,768 Hz (ACLK)
13, since the ideal division factor is 13.65
6B:m7 = 0, m6 = 1, m5 = 1, m4 = 0, m3 = 1, m2 = 0, m1 = 1 and
m0 = 1 The LSB of UxMCTL is used first.
[ 2x ( 1 ) 6 ) ) (0
UxBR ) 0) ] * 1 * 0
[ 2x ( 1 ) 6 ) ) (1
UxBR ) 1) ] –1–1
[ 2x ( 1 ) 6 ) ) (2
UxBR ) 1) ] –1–2
[ 2x ( 1 ) 6 ) ) (3
UxBR ) 2) ] –1–3
[ 2x ( 1 ) 6 ) ) (4
UxBR ) 2) ] –1–4
[ 2x ( 1 ) 6 ) ) (5
UxBR ) 3) ] –1–5
[ 2x ( 1 ) 6 ) ) (6
UxBR ) 4) ] –1–6
[ 2x ( 1 ) 6 ) ) (7
UxBR ) 4) ] –1–7
[ 2x ( 1 ) 6 ) ) (8
UxBR ) 5) ] –1–8
[ 2x ( 1 ) 6 ) ) (9
UxBR ) 6) ] –1–9
[ 2x ( 1 ) 6 ) ) (10
UxBR ) 6) ] –1–10
USART Peripheral Interface, UART Mode
USART Operation: UART Mode
100% + 2.54%
100% + 5.08%
100% + 0.29%
100% + 2.83%
100% + –1.95%
100% + 0.59%
100% + 3.13%
100% + –1.66%
100% + 0.88%
100% + 3.42%
100% + –1.37%
13-15
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