S912XET256J2MAL Datasheet, PDF(361/1324 Page) Freescale Semiconductor, Inc – MC9S12XEP100 Reference Manual Covers MC9S12XE Family

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S912XET256J2MAL Datasheet, PDF (361/1324 Pages) Freescale Semiconductor, Inc – MC9S12XEP100 Reference Manual Covers MC9S12XE Family

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Chapter 10 XGATE (S12XGATEV3)

Table 10-2. XGMCTL Field Descriptions (Sheet 3 of 3)

Field

Description

4

XGSS

XGATE Single Step â This bit forces the execution of a single instruction.(1)

Read:

0 No single step in progress

1 Single step in progress

Write

0 No effect

1 Execute a single RISC instruction

Note: Invoking a Single Step will cause the XGATE to temporarily leave Debug Mode until the instruction has

been executed.

3

XGFACT

Fake XGATE Activity â This bit forces the XGATE to ï¬ag activity to the MCU even when it is idle. When it is set

the MCU will never enter system stop mode which assures that peripheral modules will be clocked during XGATE

idle periods

Read:

0 XGATE will only ï¬ag activity if it is not idle or in debug mode.

1 XGATE will always signal activity to the MCU.

Write:

0 Only ï¬ag activity if not idle or in debug mode.

1 Always signal XGATE activity.

1

XGSWEF

XGATE Software Error Flag â This bit signals a software error. It is set whenever the RISC core detects an

error condition(2). The RISC core is stopped while this bit is set. Clearing this bit will terminate the current thread

and cause the XGATE to become idle.

Read:

0 No software error detected

1 Software error detected

Write:

0 No effect

1 Clears the XGSWEF bit

0

XGATE Interrupt Enable â This bit acts as a global interrupt enable for the XGATE module

XGIE Read:

0 All outgoing XGATE interrupts disabled (except software error interrupts)

1 All outgoing XGATE interrupts enabled

Write:

0 Disable all outgoing XGATE interrupts (except software error interrupts)

1 Enable all outgoing XGATE interrupts

1. Refer to Section 10.6.1, âDebug Featuresâ

2. Refer to Section 10.4.5, âSoftware Error Detectionâ

10.3.1.2 XGATE Channel ID Register (XGCHID)

The XGATE Channel ID Register (Figure 10-4) shows the identiï¬er of the XGATE channel that is

currently active. This register will read â$00â if the XGATE module is idle. In debug mode this register

can be used to start and terminate threads. Refer to Section 10.6.1, âDebug Featuresâ for further

information.

MC9S12XE-Family Reference Manual Rev. 1.25

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