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 18 Periodic Interrupt Timer (S12PIT24B4CV2)
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18.1.4
Block Diagram
Figure 18-1
shows a block diagram of the PIT module.
Micro Time
Base 0
Time-Out 0
Interrupt 0
Interface
Trigger 0
Interrupt 1
Interface
Trigger 1
Interrupt 2
Interface
Trigger 2
Interrupt 3
Interface
Trigger 3
Bus Clock
8-Bit
Micro Timer 0
16-Bit Timer 0
16-Bit Timer 1
8-Bit
Micro Timer 1
Micro
Time
Base 1
Time-Out 1
16-Bit Timer 2
Time-Out 2
16-Bit Timer 3
Time-Out 3
Figure 18-1. PIT24B4C Block Diagram
18.2
External Signal Description
The PIT module has no external pins.
18.3
Register Definition
This section consists of register descriptions in address order of the PIT. Each description includes a
standard register diagram with an associated figure number. Details of register bit and field function follow
the register diagrams, in bit order.
MC9S12XE-Family Reference Manual , Rev. 1.19
678
Freescale Semiconductor
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
Run mode
This is the basic mode of operation.
Wait mode
PIT operation in wait mode is controlled by the PITSWAI bit located in the PITCFLMT register.
In wait mode, if the bus clock is globally enabled and if the PITSWAI bit is clear, the PIT operates
like in run mode. In wait mode, if the PITSWAI bit is set, the PIT module is stalled.
Stop mode
In full stop mode or pseudo stop mode, the PIT module is stalled.
Freeze mode
PIT operation in freeze mode is controlled by the PITFRZ bit located in the PITCFLMT register.
In freeze mode, if the PITFRZ bit is clear, the PIT operates like in run mode. In freeze mode, if the
PITFRZ bit is set, the PIT module is stalled.
