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| 型號： | RX78K4 |
| 英文描述： | 78K/IV Series Real-Time OS Fundamental | User＇s Manual[01/1997] |
| 中文描述： | 78K/IV系列實時操作系統(tǒng)的基本|用戶手冊[01/1997] |
| 文件頁數(shù)： | 31/96頁 |
| 文件大?。?/td> | 265K |
| 代理商： | RX78K4 |
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CHAPTER 3 RX78K/IV BASIC OPERATIONS AND CONTROL BLOCKS
22
3.1
RX78K/IV Configuration
3.1.1
Flow of overall processing
RX78K/IV uses register bank 0 of the 8 register banks of the 78K/IV series microcomputers. For user tasks,
multiple tasks can be allocated to register bank 1, and one task each to register bank 2 to 7.
The tasks allocated to register banks 2 to 7 can realize high-speed task switching, because with them, it is
unnecessary to save the registers when tasks are switched over during execution.
An example method for allocating register banks is shown below.
Example 1:
With 6 tasks
Register bank 1
Register banks 2 to 7 :
:
None
One task each
Example 2:
With 6 tasks
Register bank 1
Register banks 2 to 4 :
Register banks 5 to 7 :
:
3 tasks
One task each
For interrupting
Example 3:
With 10 tasks
Register bank 1
Register banks 2 to 7 :
:
4 tasks
One task each
The task area is required for each task; therefore, when performing a task, the stack area of the task is used. The
interrupt handler uses the stack area of the task being performed when an interrupt occurred.
The stack state in dispatching is shown below.
Fig. 3-1 Stack State in Dispatching
Stack area
PC15-8
PSWH
R15
R13
R
PC19-16
PC7-0
PSWL
R14
R2
R0
High
Low
Stack area
PC15-8
PSWH
PC19-16
PC7-0
PSWL
High
Low
When tasks are allocated to register bank 1
When tasks are allocated to register bank 2 to 7
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