參數(shù)資料
型號(hào): R8820LV
廠商: Electronic Theatre Controls, Inc.
英文描述: 16-BIT RISC MICROCONTROLLER
中文描述: 16位RISC微控制器
文件頁(yè)數(shù): 28/98頁(yè)
文件大?。?/td> 1000K
代理商: R8820LV
R DC
RISC DSP Controller
R8820LV
RDC Semiconductor Co.
Rev:1.0
Subject to change without notice
28
11.4 Bus Hold
When the bus hold requested ( HOLD pin active high) by the another bus master, the microprocessor will issue a HLDA
in response to a HOLD request at the end of T4 or Ti. When the microprocessor is in hold status (HLDA is high), the AD15-
AD0, A19-A0, WR ,
RD
,DEN , S -S ,S ,
BHE
, DT/
R
,WHB andWLB are floating, and the UCS, LCS,
6
PCS -
5
PCS ,
3
MCS -
0
MCS and
3
PCS -
0
PCS will be drive high. After HOLD is detected as being low, the microprocessor will
lower the HLDA.
CLKOUTA
HOLD
HLDA
A19:A0
DEN
S6
S2:S0
AD15:AD0
RD
WR
DT/R
WLB
BUS HOLD ENTER WAVEFORM
2
7
Case 1
Case 2
Ti
T3
Ti
T4
Ti
Ti
Ti
Ti
Floating
Floating
Floating
Floating
Floating
Floating
Floating
Floating
Floating
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