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參數(shù)資料
| 型號： | ST6225CB1 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, OSCILLATOR SAFEGUARD, SAFE RESET AND 28 PINS |
| 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，振蕩器保障，安全復(fù)位和28個引腳 |
| 文件頁數(shù)： | 34/70頁 |
| 文件大小： | 472K |
| 代理商： | ST6225CB1 |
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34
ST62T15C/T25C/E25C
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
23. All other transitions are potentially risky and
should be avoided when changing the I/O operat-
ing mode, as itis most likely that undesirable side-
effects willbe experienced, such asspurious 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 theseinstructions make an implicit
read and write back of the entire register. In port
input mode, however, the data registerreads from
the input pins directly, and not from the data regis-
ter latches. Since data registerinformation 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, itis 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 23. Diagram showingSafe 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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相關(guān)代理商/技術(shù)參數(shù) |
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| ST6225CB1/XXX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| ST6225CB3 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, OSCILLATOR SAFEGUARD, SAFE RESET AND 28 PINS |
| ST6225CB3/XXX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| ST6225CB6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, OSCILLATOR SAFEGUARD, SAFE RESET AND 28 PINS |
| ST6225CB6/XXX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
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