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| 型號(hào)： | ST623X-KIT |
| 英文描述： | 8 MBIT (X8, BLOCK ERASE) FLASH MEMORY |
| 中文描述： | 入門套件小冊(cè)子的ST6230 |
| 文件頁(yè)數(shù)： | 39/86頁(yè) |
| 文件大?。?/td> | 531K |
| 代理商： | ST623X-KIT |
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ST62T30B ST62E30B
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 transitionsare illustrated in Figure 2.
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 22. Diagram showingSafe I/O State Transitions
Note *.
xxx = DDR, OR, DR Bits respectively
5 I/O PORTS
(Cont’d)
Table 14. I/O Port configuration for the ST62T30B/E30B
Note 1
. Provided the correct configuration has been selected.
I/O PORTS
(Cont’d)
5.0.1 ARTimer alternate functions
As long as PWMEN (resp. OVFEN) bitis kept low,
the PA3/PWM (resp. PA2/OVF) pin is used as
standard I/O pin and thereforecan beconfigured in
any mode through the DDR and OR registers.
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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