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參數(shù)資料
| 型號： | ST62E35B |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, 16-BIT AUTO-RELOAD TIMER, EEPROM, SPI AND UART |
| 中文描述： | 8位檢察官辦公室/存儲器與阿微控制器/ D轉(zhuǎn)換器，16位自動重加載定時器，EEPROM中，SPI和UART |
| 文件頁數(shù)： | 34/82頁 |
| 文件大?。?/td> | 617K |
| 代理商： | ST62E35B |
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ST62T35B/E35B
I/O PORTS
(Cont’d)
4.1.2 Safe I/O State Switching Sequence
Switching the I/O ports from one state to another
should be done in a sequence which ensures that
no unwanted side effects can occur. The recom-
mended safe transitions are illustrated inFigure
19.. All other transitions are potentially risky and
should be avoided when changing the I/O operat-
ing mode, as it is most likely that undesirable side-
effects will be experienced, such as spurious inter-
rupt generation ortwopins shorted together by the
analog multiplexer.
Single bit instructions (SET, RES, INC and DEC)
should be used with great caution on Ports Data
registers, since these instructions make an implicit
read and write back of the entire register. In port
input mode, however, the data register reads from
the input pins directly, and not from the data regis-
ter latches. Since data register information in input
mode is used to set the characteristics of the input
pin (interrupt, pull-up, analog input), these may be
unintentionally reprogrammed depending on the
state of the input pins. As a general rule, it is better
to limit the use of single bit instructions on data
registers to when the whole (8-bit) port is in output
mode. In the case of inputs or of mixed inputs and
outputs, it is advisable to keep a copy of the data
register in RAM. Single bit instructions may then
be used on the RAM copy, after which the whole
copy register can be written to the port data regis-
ter:
SET bit, datacopy
LD a, datacopy
LD DRA, a
Care must also be taken to notuse INC or DECin-
structions on a port register when the 8 bits are not
available on the devices.
The WAIT and STOP instructions allow the
ST62xx to be used in situations where low power
consumption is needed. The lowest power con-
sumption is achieved by configuring I/Os in input
mode with well-defined logic levels.
The user must take care not to switch outputs with
heavy loads during the conversion of one of the
analog inputs in order to avoid any disturbance to
the conversion.
Figure 19. Diagram showing Safe I/O State Transitions
Note *.
xxx = DDR, OR, DR Bits respectively
Interrupt
pull-up
Output
Open Drain
Output
Push-pull
Input
pull-up (Reset
state)
Input
Analog
Output
Open Drain
Output
Push-pull
Input
010*
000
100
110
011
001
101
111
33
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| ST62E35BG1 | 功能描述:8位微控制器 -MCU UV EPROM 8K RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| ST62E3X-EPB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:EPROM PROGRAMMING BOARDS DATASHEET FOR ST62 FAMILY |
| ST62E3X-EPB/110 | 功能描述:程序設(shè)計器 - 基于處理器 ST62 EPROM Programmr RoHS:否 制造商:Olimex Ltd. 產(chǎn)品:Programmers 工具用于評估:XMEGA, MegaAVR, tinyAVR 核心:AVR 接口類型:USB 工作電源電壓:1.8 V to 5.5 V |
| ST62E40 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:GANG PROGRAMMERS FOR ST62 MCU FAMILY |
| ST62E40B | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCU WITH LCD DRIVER, EEPROM AND A/D CONVERTER |
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