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参数资料
| 型号： | MV20556C16-PQRS |
| 厂商： | MOSEL-VITELIC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PDSO20 |
| 封装： | SOP-20 |
| 文件页数： | 8/30页 |
| 文件大小： | 106K |
| 代理商： | MV20556C16-PQRS |
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MV20556
MOSEL VITELIC INC.
16/27
PID256** 07/97
Specifications subject to change without notice, contact your sales representatives for the most recent information.
Preliminary
External Interface
Reset
Processor initialization is accomplished with acitivation
of the RES pin. To reset the processor, this pin should
be held high for at least twenty-four oscillator periods.
Upon powering up, RES should be held high for at least
1 ms after the power supply stabilizes to allow the
oscillator to stabilize.
Upon receipt of RES, the
processor ceases instruction execution and remains
dormant for the duration of the pulse. The pins assume
their initialization states within 2 machine cycles clocks.
The low-going transition then initiates a sequence
which requires approximately twelve oscillator periods
to execute before ALE(internal signal) is generated and
normal operation commences with the instruction at
absolute location 0000H.
This sequence ends with
registers initialized as shown in right table.
When the processor is reset all ports are immediately
written with ones (1's).
The Schimitt-trigger input has a small internal pull down
resistor which permits power-on reset (as shown in
right to Figure) using only a small capacitor tied to
VDD. A conventional external reset circuit, such as
that in right Figure, can also be used.
I OL
Output low current.
For port 1 and port 3, MV20556 provided I OL up to
18mA per pin typicallly at VOL=0.45V. User are free to
choose any one of these 15 pins to perform this high
current sink capability. But they are restricted: no more
than 80 mA I OLs for all output pins.
Register
PC
SP
PSW
DPH, DPL
A, B
IP
IE
SCON
TMOD
TCON
TH1, TH0
TL1, TL0
SBUF
Port 1 & 3
Internal RAM
Content after
Reset at Power on
0000H
07H
00H
E0H or 00H
60H or 00H
00H
indeterminate
FFH (*1)
indeterminate
Content after
Reset while running
0000H
07H
00H
E0H or 00H
60H or 00H
00H
indeterminate
FFH (*1)
unchanged
*1 configures all i/o pins as inputs
Register vs Reset
Power-on Reset
External Reset
30
F
RES
R
MV20556
RES
R
MV20556
1K ohm
30
F
RES
R
MV20556
1K ohm
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