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參數(shù)資料
| 型號(hào)： | EM6517 |
| 廠(chǎng)商： | Electronic Theatre Controls, Inc. |
| 元件分類(lèi)： | 4位微控制器 |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 4位單片機(jī)的小型通用紅外遙控器 |
| 文件頁(yè)數(shù)： | 48/66頁(yè) |
| 文件大小： | 762K |
| 代理商： | EM6517 |
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EM6517
FOR ENGINEERING ONLY
EM Microelectronic-Marin SA, 09/99, Rev. A/277
48
19 Mask Options
Most options which in many μControllers are realized as metal mask options are directly user selectable with
the option registers, therefore allowing a maximum freedom of choice .
The following options can be selected at the time of programming the metal mask ROM.
19.1 Input / Output Ports
19.1.1 Port A Metal Options
Pull-up or no pull-up can be selected
for each port A input. A pull-up
selection is excluding a pull-down on
the same input.
Pull-down (default) or no pull-down
can be selected for each port A input.
A pull-down selection is excluding a
pull-up on the same input.
The total pull value (pull-up or pull-
down) is a series resistance out of
the resistance R1 and the switching
transistor. As a switching transistor
the user can choose between a high
impedance
(weak)
impedance (strong) switch. Weak,
strong or none must be chosen. The
default is strong. The default resistor
R1 value is 100 KOhm. The user
may choose a different value from
150 KOhm down to 0 Ohm. However
the value must first be checked and
agreed by EM Microelectronic Marin
SA.
or
a
low
To select an option put an
X
in
column 1,2 and 4 and reconfirm the
R1 value in column 3.
The default value is : Strong pull-
down with R1=100 KOhm
To select an option put an
X
in
column 1,2 and 4 and reconfirm the
R1 value in column 3.
The default value is : No pull-up
Figure 32. Port A Pull Options
Resistor R1
100 KOhm
MPAPDweak[n]
Weak Pull-down
MPAPDstrong[n]
Strong Pull-down
MPAPUweak[n]
Weak Pull-up
MPAPUstrong[n]
Strong Pull-up
Pull-up Control
PA[n]
Terminal
No Pull-up
No Pull-down
Pull-down Control
OR
Input Circuitry
Option
Name
Strong
Pull-
down
W
Pull-
down
R1
Value
Typ.100
k
3
100k
100k
100k
100k
No
Pull-
down
1
2
4
MPAPD[3]
MPAPD[2]
MPAPD[1]
MPAPD[0]
PA3 input pull-down
PA2 input pull-down
PA1 input pull-down
PA0 input pull-down
X
X
X
X
Option
Name
Strong
Pull-up
Weak
Pull-up
R1
Value
typ.100k
3
No
Pull-up
1
2
4
MPAPU[3]
MPAPU[2]
MPAPU[1]
MPAPU[0]
PA3 input pull-up
PA2 input pull-up
PA1 input pull-up
PA0 input pull-up
X
X
X
X
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