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參數(shù)資料
| 型號(hào)： | MTA85412S-04I/SS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO20 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-20 |
| 文件頁(yè)數(shù)： | 12/72頁(yè) |
| 文件大?。?/td> | 760K |
| 代理商： | MTA85412S-04I/SS |
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MTA85XXX
DS40115C-page 2
1995 Microchip Technology Inc.
PIN DESCRIPTIONS
Name
Function
Description
RA3: RA0
I/O PORTA
4 input/output lines.
RB7: RB0
I/O PORTB
8 input/output lines.
SVDD/RB7
Shared VDD-I/O pin
Input/Output pin dedicated to EEPROM VDD.
No external connection needed. MTA85X1X only.
T0CKI*
Clock input to TMR0 Register Schmitt Trigger Input.
Clock input to T0CKI register. Must be tied to VSS or VDD if not in
use to avoid unintended entering of test modes and to reduce
current consumption.
MCLR
Master Clear
Schmitt Trigger Input.
A low voltage on this input generates a RESET for the
microcontroller.
A rising voltage triggers the on-chip oscillator start-up timer which
keeps the chip in RESET mode for about 18 ms. This input must be
tied directly, or via a pull-up resistor, to VDD.
OSC1
Oscillator (input)
XT, HS and LP devices:
Input terminal for crystal, ceramic resonator, or external clock
generator.
RC devices:
Driver terminal for external RC combination to establish oscillation.
OSC2/CLKOUT
Oscillator (output)
For XT, HS and LP devices:
Output terminal for crystal and ceramic resonator.
Do not connect any other load to this output.
Leave open if external clock generator is used.
For RC devices:
A CLKOUT signal with a frequency of 1/4 FOSC1 is put out on this
pin.
SDA
Serial EEPROM Data
EEPROM data line.
SCL
Serial EEPROM Clock
EEPROM clock line.
VDD
Power supply
VSS
Ground
* Formerly RTCC.
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