Uart 7816 Interrupt Status Register (Uartx_Is7816) - NXP Semiconductors MKL27Z128VFM4 Reference Manual

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38.4.15 UART 7816 Interrupt Status Register (UARTx_IS7816)

The IS7816 register provides a mechanism to read and clear the interrupt flags. All flags/

interrupts are cleared by writing a 1 to the field location. Writing a 0 has no effect. All

bits are "sticky", meaning they indicate that only the flag condition that occurred since

the last time the bit was cleared, not that the condition currently exists. The status flags

are set regardless of whether the corresponding field in the IE7816 is set or cleared. The

IE7816 controls only if an interrupt is issued to the host processor. This register is

specific to 7816 functionality and the values in this register have no affect on UART

operation and should be ignored if 7816E is not set/enabled. This register may be read or

written at anytime.

Address: 4006_C000h base + 1Ah offset = 4006_C01Ah

Wait Timer Interrupt

Indicates that the wait time, the time between the leading edge of a character being transmitted and the

leading edge of the next response character, has exceeded the programmed value. This flag asserts only

when C7816[TTYPE] = 0. This interrupt is cleared by writing 1.

Wait time (WT) has not been violated.

Wait time (WT) has been violated.

Character Wait Timer Interrupt

Indicates that the character wait time, the time between the leading edges of two consecutive characters

in a block, has exceeded the programmed value. This flag asserts only when C7816[TTYPE] = 1. This

interrupt is cleared by writing 1.

Character wait time (CWT) has not been violated.

Character wait time (CWT) has been violated.

Block Wait Timer Interrupt

Indicates that the block wait time, the time between the leading edge of first received character of a block

and the leading edge of the last character the previously transmitted block, has exceeded the programmed

value. This flag asserts only when C7816[TTYPE] = 1.This interrupt is cleared by writing 1.

Block wait time (BWT) has not been violated.

Block wait time (BWT) has been violated.

Initial Character Detected Interrupt

Indicates that a valid initial character is received. This interrupt is cleared by writing 1.

Freescale Semiconductor, Inc.

Chapter 38 Universal Asynchronous Receiver/Transmitter(UART)

UARTx_IS7816 field descriptions

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KL27 Sub-Family Reference Manual , Rev. 5, 01/2016