參數(shù)資料
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): 76/96頁
文件大小: 265K
代理商: RX78K4
67
CHAPTER 5 RX78K/IV RESET OPERATION
A system running RX78K/IV is initialized when the system initialization reset routine stored with RX78K/IV in the
internal ROM or external memory of the 78K/IV series is expected.
After resetting the device, the system is branched out to the address which is set in address 0000H. Therefore, be
sure to set the address of the user’s initialization routine. Make sure that the user initial routine performs necessary
processing such as initialization of the peripheral hardware. After this, read out the location address of the kernel
from the initialization information table created by the configurator, and branch to the reset routine for system
initialization. At this time, set the top address of the initialization information table to the TDE register.
Fig. 5-1 shows an example program to branch to the reset routine for system initialization.
The reset routine for system initialization initializes the reserved area and object in accordance with the
initialization information table. After initialization, control is passed to the RX78K/IV dispatcher. The dispatcher
selects a task from a ready queue initialized by the reset routine and places the task in the RUN state. The task
selected at this time is called an initial task.
Fig. 5-1 Reset Routine Branch Program for System Initialization (Large model)
NAME
RES_PROG
;
EXTRN
SYS_INF,
; initialization information table
;
VCTTB10
CSEG
AT 0000H
DW
RES_RTN
; sets vector address at reset
VCTTBL1
CSEG
AT 0018H
DW
TMDSP
; sets vector address for timer processing
RESRTN
CSEG
RES_RTN:
LOCATION 0FH
(Initialization of RAM, initialization of peripheral hardware, etc.)
MOVG
TDE, #SYS_INF
; sets top address of the initialization
information table to TDEreg.
MOVW
AX, [TDE]
; sets kernel location address to AXreg.
BR
AX
; branches to the reset routine for system
initialization of RX78K/IV
;
END
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