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Chapter 6 XGATE (S12XGATEV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

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Freescale Semiconductor

6.5

Interrupts

6.5.1

Incoming Interrupt Requests

XGATE threads are triggered by interrupt requests which are routed to the XGATE module (see

S12X_INT Section). Only a subset of the MCU’s interrupt requests can be routed to the XGATE. Which

speciﬁc interrupt requests these are and which channel ID they are assigned to is documented in Section

“Interrupts” of the SoC Guide.

6.5.2

Outgoing Interrupt Requests

There are three types of interrupt requests which can be triggered by the XGATE module:

4. Channel interrupts

For each XGATE channel there is an associated interrupt ﬂag in the XGATE interrupt ﬂag vector

(XGIF, see Section 6.3.1.4, “XGATE Channel Interrupt Flag Vector (XGIF)”). These ﬂags can be

set through the "SIF" instruction by the RISC core. They are typically used to ﬂag an interrupt to

the S12X_CPU when the XGATE has completed one of its tasks.

5. Software triggers

Software triggers are interrupt ﬂags, which can be set and cleared by software (see Section 6.3.1.5,

“XGATE Software Trigger Register (XGSWT)”). They are typically used to trigger XGATE tasks

by the S12X_CPU software. However these interrupts can also be routed to the S12X_CPU (see

S12X_INT Section) and triggered by the XGATE software.

6. Software error interrupt

The software error interrupt signals to the S12X_CPU the detection of an error condition in the

XGATE application code (see Section 6.4.5, “Software Error Detection”).

All XGATE interrupts can be disabled by the XGIE bit in the XGATE module control register (XGMCTL,

see Section 6.3.1.1, “XGATE Control Register (XGMCTL)”).

6.6

Debug Mode

The XGATE debug mode is a feature to allow debugging of application code.

6.6.1

Debug Features

In debug mode the RISC core will be halted and the following debug features will be enabled:

•

Read and Write accesses to RISC core registers (XGCCR, XGPC, XGR1–XGR7)1

All RISC core registers can be modified. Leaving debug mode will cause the RISC core to continue

program execution with the modified register values.

1. Only possible if MCU is unsecured

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