General specification

STA2416

22/38

6.4

Master reset

When the device’s reset is held active (NRESET is low), UART1_TXD and UART2_TXD are

set to input state. When the NRESET returns high, the device starts to boot.

Note:

The device should be held in active reset for minimum 20 ms in order to guarantee a

complete reset of the device.

6.5

Interrupts/wake-up

All GPIOs can be used both as external interrupt source and as wake-up source. In addition

the chip can be woken-up by USB, UART1_RXD, UART2_RXD, INT1, INT2.

6.6

V1.2 detailed functionality - extended SCO

User perspective - extended SCO

This function gives improved voice quality since it enables the possibility to retransmit lost or

corrupted voice packets in both directions.

Technical perspective - extended SCO

eSCO incorporates CRC, negotiable data rate, negotiable retransmission window and

multi-slot packets. Retransmission of lost or corrupted packets during the retransmission

window guarantees on-time delivery.

Figure 4.

eSCO

SCO

SCO

SCO

SCO

ACL

SCO

SCO

ACL

t

eSCO retransmission window