S912XEG128J2VAL
| Model | S912XEG128J2VAL |
| Description | IC,MICROCONTROLLER,16-BIT,CPU12 CPU,CMOS,QFP,112PIN,PLASTIC |
| PDF file | Total 1327 pages (File size: 7M) |
| Chip Manufacturer | ROCHESTER |
Chapter 10
XGATE (S12XGATEV3)
Table 10-1. Revision History
Revision
Number
V03.22
V03.23
V03.24
Revision Date
06 Oct 2005
14 Dec 2005
17 Jan 2006
10.9.2/10-461
Sections
Affected
- Internal updates
- Updated code example
- Internal updates
Description of Changes
10.1
Introduction
The XGATE module is a peripheral co-processor that allows autonomous data transfers between the
MCU’s peripherals and the internal memories. It has a built in RISC core that is able to pre-process the
transferred data and perform complex communication protocols.
The XGATE module is intended to increase the MCU’s data throughput by lowering the S12X_CPU’s
interrupt load.
Figure 10-1
gives an overview on the XGATE architecture.
• XGATE registers (Section
10.3, “Memory Map and Register Definition”)
• XGATE RISC core (Section
• Hardware semaphores (Section
• Interrupt handling (Section
• Debug features (Section
• Security (Section
• Instruction set (Section
10.1.1
Glossary of Terms
XGATE Request
A service request from a peripheral module which is directed to the XGATE by the S12X_INT
module (see
Figure 10-1).
Each XGATE request attempts to activate a XGATE channel at a certain
priority level.
XGATE Channel
The resources in the XGATE module (i.e. Channel ID number, Priority level, Service Request
Vector, Interrupt Flag) which are associated with a particular XGATE Request.
MC9S12XE-Family Reference Manual , Rev. 1.19
Freescale Semiconductor
351
Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not
available from Freescale for import or sale in the United States prior to September 2010: S12XE products in 208 MAPBGA packages
