TMPR3916 datasheet(174/225 Pages) TOSHIBA

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Chapter 9 Synchronous Serial I/O (TXSEI)

Preliminary

9-19

9.3.2.4

SETF – Transfer Format Error

This error is generated, if the transfer format is violated.

There are two different scenarios, in which a Transfer Format Error could occur.

In slave mode, a transfer format error will be signaled, if:

•

the slave select pin is used for TXSEI purpose (Configured in the port register) and

•

TXSEI is in the middle of a transfer and

•

the number of bits received yet is smaller than the number specified in the SSZ (SECR1)

and if the slave select signal is set inactive at this point. It signals the user, that the master ended

the transfer before the expected end of the transfer. A possible cause for this error could be

different transfer length settings for master and slave devices. The partially received value will not

be stored in the receive buffer since it is not complete.

In master mode, a transfer format error will be signaled, if:

•

the slave select input signal is enabled in master mode (SSIVAL bit in SECR0 register) and

•

both the master bit is set to one (MSTR bit in SECR0) and the system is in active mode

(OPMODE=“10” in SEMCR) and

•

the Slave Select signal is asserted.

9.4

Interrupts

TXSEI connects to three interrupt signals.

•

SEIEXC: System Error Flags SEOE, SEUE, SETF, SIDLE (separately maskable)

•

SEIRX

Rx Buffer Fill Level Interrupt, Flag RBSI (not maskable)

•

SEITX

Tx Buffer Fill Level Interrupt, Flag TBSI (not maskable)

Interrupt SEIEXC is used for error detection purpose (SEOE, SEUE, SETF) and idle state interrupt

(SIDLE). The interrupts SEIRX and SEITX are used to fetch and setup new data in an interrupt service

routine for transferring data.

All the interrupts will occur one system clock cycle later than the internal flags, which are visible in the

status register.

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