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参数资料
| 型号： | ST6265C |
| 英文描述： | 8-BIT MICROCONTROLLER ( MCU ) WITH OTP. ROM. FASTROM. EPROM. A/D CONVERTER. SAFE RESET. AUTO-RELOAD TIMER. EEPROM AND SPI |
| 中文描述： | 8位微控制器（MCU）的与检察官办公室。光盘。 FASTROM。存储器。的A / D转换器。安全复位。自动重加载定时器。的EEPROM和SPI |
| 文件页数： | 39/84页 |
| 文件大小： | 918K |
| 代理商： | ST6265C |
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ST62T53C/T60C/T63C ST62E60C
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 in
Figure
24
. 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 or two pins 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
Warning:
Care must also be taken to not use in-
structions that act on a whole port register (INC,
DEC, or read operations) when all 8 bits are not
available on the device. Unavailable bits must be
masked by software (AND instruction).
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 24. 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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ST626X | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8/16-Bit Micros |
| ST626XC-KIT | 制造商:STMicroelectronics 功能描述:ST625X, 6X KIT - Bulk |
| ST626XC-KIT/EU | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:DEVELOPMENT KIT ST626 EURO |
| ST626XC-KIT/UK | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:ST62 KIT |
| ST626XC-KIT/US | 功能描述:开发板和工具包 - 其他处理器 ST626X Starter Kit RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压: |
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