參數資料
型號: 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
文件頁數: 24/98頁
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
24
internal clock .
Bit 8: CAD
, CLKOUTA Drive Disable.
Set 1: Disable the CLKOUTA. This pin will be three-state.
Set 0 : Enable the CLKOUTA.
Bit 7-3
: Reserved
Bit 2-0: F2- F0,
Clock Divisor Select.
F2, F1, F0
-----
Divider Factor
0, 0, 0 ---- Divide by 1
0, 0, 1 ---- Divide by 2
0, 1, 0 ---- Divide by 4
0, 1, 1 ---- Divide by 8
1, 0, 0 ---- Divide by 16
1, 0, 1 ---- Divide by 32
1, 1, 0 ---- Divide by 64
1, 1, 1 ---- Divide by 128
10. Reset
Processor initialization is accomplished with activation of theRST pin. To reset the processor, this pin should be held low
for at least seven oscillator periods. The Reset Status Figure shows the status of the RST pin and others relation pins.
WhenRST from low go high , the state of input pin (with weakly pull-up or pull-down) will be latched , and each pin will
perform the individual function. The AD15-AD0 will be latched into the register F6h.UCS/
1
ONCE , LCS/
0
ONCE will
enter ONCE mode (All of the pins will floating except X1 , X2) when with pull-low resisters. The input clock will divide by
2 when S6/
2
CLKDIV with pull-low resister. The AD15-AD0 bus will not drive the address phase duringUCS ,LCS cycle
if BHE /ADEN with pull-low resister
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