參數(shù)資料
型號: UPD72042
廠商: NEC Corp.
英文描述: LSI DEVICES FOR Inter Equipment BusTM (IEBusTM) PROTOCOL CONTROL
中文描述: LSI器件間設備BusTM(IEBusTM)協(xié)議控制
文件頁數(shù): 72/92頁
文件大?。?/td> 373K
代理商: UPD72042
μ
PD72042
72
Data Sheet S14870EJ1V0DS00
6.4 PROCESSING ROUTINES
This section describes the processing routines called from the main routine.
6.4.1
μ
PD72042 Initial Setting Routine
This routine is executed when the
μ
PD72042 is first started or upon the detection of a program crash (RAW = 1).
Fig. 6-4 shows the flow of the
μ
PD72042 initial setting routine.
Fig. 6-4
μ
PD72042 Initial Setting Routine
Note
There are two methods of performing reset, as follows:
1 Set the RESET pin to low.
2 Set SRST in CTR to 1.
Type 1 reset causes the
μ
PD72042 to enter standby mode, thus requiring the subsequent release of
standby mode.
Caution To enable normal IEBus communication, always perform the above initial setting.
6.4.2 Communication Flag Initialization Routine
This routine initializes the communication flags listed in Table 6-1, as follows:
RAWF
TRRQ
W
RERQ
W
SIZE
W
J
PW
PR
MCRQ
SDRQ
CORQ
MTRQF
MRRQF
STRQF
SLREF
0
0
0
0
1
0
0
0
0
0
0
0
0
0
Start
Reset PD72042
Note
UAR1
Local station address (four low-order bits)
UAR2
Local station address (eight high-order bits)
Condition code
End
CMR
100000 b1 b0
; Set local address and condition code.
; Set condition code.
; Set optional functions.
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