PC912XDP512F0CALR datasheet(195/1348 Pages) FREESCALE

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Chapter 6 XGATE (S12XGATEV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

195

6.3.1.5

XGATE Software Trigger Register (XGSWT)

The eight software triggers of the XGATE module can be set and cleared through the XGATE software

trigger register (Figure 6-7). The upper byte of this register, the software trigger mask, controls the write

access to the lower byte, the software trigger bits. These bits can be set or cleared if a "1" is written to the

associated mask in the same bus cycle.

Read: Anytime

Write: Anytime

NOTE

The XGATE channel IDs that are associated with the eight software triggers

are determined on chip integration level. (see Section “Interrupts” of the Soc

Guide)

XGATE software triggers work like any peripheral interrupt. They can be

used as XGATE requests as well as S12X_CPU interrupts. The target of the

software trigger must be selected in the S12X_INT module.

00000000

XGSWT[7:0]

XGSWTM[7:0]

Reset

0000000000000

Figure 6-7. XGATE Software Trigger Register (XGSWT)

Table 6-5. XGSWT Field Descriptions

Field

Description

15–8

XGSWTM[7:0]

Software Trigger Mask — These bits control the write access to the XGSWT bits. Each XGSWT bit can only

be written if a "1" is written to the corresponding XGSWTM bit in the same access.

Read:

These bits will always read "0".

Write:

0 Disable write access to the XGSWT in the same bus cycle

1 Enable write access to the corresponding XGSWT bit in the same bus cycle

7–0

XGSWT[7:0]

Software Trigger Bits — These bits act as interrupt ﬂags that are able to trigger XGATE software channels.

They can only be set and cleared by software.

Read:

0 No software trigger pending

1 Software trigger pending if the XGIE bit is set

Write:

0 Clear Software Trigger

1 Set Software Trigger

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