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參數(shù)資料
| 型號： | T48C862x-Rf-TNQ |
| 廠商： | Atmel Corp. |
| 元件分類： | 4位微控制器 |
| 英文描述： | Microcontroller with UHF ASK/FSK Transmitter |
| 中文描述： | 微控制器，帶有超高頻ASK / FSK發(fā)射器 |
| 文件頁數(shù)： | 21/108頁 |
| 文件大?。?/td> | 1023K |
| 代理商： | T48C862X-RF-TNQ |
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21
T48C862-R4 [Preliminary]
4551C–4BMCU–01/04
Master Reset
The master reset forces the CPU into a well-defined condition. It is unmaskable and is
activated independent of the current program state. It can be triggered by either initial
supply power-up, a short collapse of the power supply, brown-out detection circuitry,
watchdog time-out, or an external input clock supervisor stage (see Figure 15). A master
reset activation will reset the interrupt enable flag, the interrupt pending register and the
interrupt active register. During the power-on reset phase, the I/O bus control signals
are set to reset mode, thereby, initializing all on-chip peripherals. All bi-directional ports
are set to input mode.
Attention:
During any reset phase, the BP20/NTE input is driven towards V
DD
by an
additional internal strong pull-up transistor. This pin must not be pulled down to V
SS
dur-
ing reset by any external circuitry representing a resistor of less than 150 k
.
Releasing the reset results in a short call instruction (opcode C1h) to the ROM address
008h. This activates the initialization routine $RESET which in turn has to initialize all
necessary RAM variables, stack pointers and peripheral configuration registers (see
Table 9 on page 32).
Figure 15.
Reset Configuration
Power-on Reset and
Brown-out Detection
The microcontroller block has a fully integrated power-on reset and brown-out detection
circuitry. For reset generation no external components are needed.
These circuits ensure that the core is held in the reset state until the minimum operating
supply voltage has been reached. A reset condition will also be generated should the
supply voltage drop momentarily below the minimum operating level except when a
power-down mode is activated (the core is in SLEEP mode and the peripheral clock is
stopped). In this power-down mode the brown-out detection is disabled.
Two values for the brown-out voltage threshold are programmable via the BOT bit in the
SC register.
Reset
timer
res
VDD
CL
Power-on
reset
Internal
reset
CL=SYSCL/4
VDD
VSS
Brown-out
detection
VDD
VSS
Watch-
dog
CWD
res
Ext. clock
supervisor
ExIn
Pull-up
NRST
相關PDF資料 |
PDF描述 |
|---|---|
| T48C862x-Rf-TNS | Microcontroller with UHF ASK/FSK Transmitter |
| T48C893 | The multiple times programmable (MTP) version for the MARC4 ROM types |
| T48C893-TK | The multiple times programmable (MTP) version for the MARC4 ROM types |
| T48C893-TKQ | The multiple times programmable (MTP) version for the MARC4 ROM types |
| T500 | DIL 14 PIN SINGLE OUTPUT |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| T48C862X-RF-TNS | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Microcontroller with UHF ASK/FSK Transmitter |
| T48C893 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:The multiple times programmable (MTP) version for the MARC4 ROM types |
| T48C893-TK | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:The multiple times programmable (MTP) version for the MARC4 ROM types |
| T48C893-TKQ | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:The multiple times programmable (MTP) version for the MARC4 ROM types |
| T48D | 制造商:WELWYN 制造商全稱:Welwyn Components Limited 功能描述:High Voltage Precision Thick Film Resistors |
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