msm7630 Oki Semiconductor, msm7630 Datasheet - Page 62

• Manufacturer Part Number: msm7630
• Description: Universal Speech Processor
• Manufacturer: Oki Semiconductor

¡ Semiconductor
2.3 Baud Rate
• Internal baud rate generator
• Clock synchronized transfers
• Start-stop transfers
2.4 Error Detection
• Parity errors (start-stop transfers)
• Framing errors (start-stop transfers)
• Overrun errors (start-stop and clock synchronized transfers)
B = f/(8 ¥ n ¥ (256 – P))
where
At a processor (SCP) clock of 20 MHz, the maximum transfer rate is 2.5 Mbps. At 40 MHz, the
maximum transfer rate is 5 Mbps.
B = f/(16 ¥ n ¥ (256 – SBR))
where
A parity error will be detected when a parity bit generated from received data does not match the
received parity bit.
A framing error will be detected when a received stop bit is "0". When 2 stop bits have been selected,
only the first bit received will be checked.
An overrun error will be detected when the next receive frame's stop bit is detected before the
receive buffer has been read.
B :
f :
n :
P :
B :
f :
n :
SBR : baud rate adjustment value (0 £ SBR £ 255)
baud rate (bps)
processor (SCP) clock frequency (Hz)
baud rate parameter
One of 1, 2, 4, 8, 16, 32, and 64. Selected by SBR’s SBRP field.
(Refer to the register description.)
baud rate adjustment value (0 £ P £ 255)
Set by SBR’s SBRV field. (Refer to the register description.)
baud rate (bps)
processor (SCP) clock frequency (Hz)
baud rate parameter
One of 1, 2, 4, 8, 16, 32, and 64. Selected by SBR’s SBRP field.
(Refer to the register description.)
Set by SBR’s SBRV field. (Refer to the register description.)
MSM7630
62/95