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參數(shù)資料
| 型號： | ST72F321J7TA |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 64/44-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C INTERFACE |
| 中文描述： | 64/44-PIN 8位微控制器32點(diǎn)，至60,000閃存/ ROM，ADC的，5個定時器，SPI和SCI的I2C接口 |
| 文件頁數(shù)： | 185/189頁 |
| 文件大?。?/td> | 3090K |
| 代理商： | ST72F321J7TA |
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ST72321
185/189
15 KNOWN LIMITATIONS
15.1 ALL FLASH AND ROM DEVICES
15.1.1 External RC option
The External RC clock source option described in
previous datasheet revisions is no longer support-
ed and has been removed from this specification.
15.1.2 CSS Function
The Clock Security System function is not guaran-
teed. The features described in
Section 6.4.3
are
subject to revision.
15.1.3 Safe Connection of OSC1/OSC2 Pins
The OSC1 and/or OSC2 pins must not be left un-
connected otherwise the ST7 main oscillator may
start and, in this configuration, could generate an
f
OSC
clock frequency in excess of the allowed
maximum (>16MHz.), putting the ST7 in an un-
safe/undefined state. Refer to
section 6.2 on page
24
.
15.1.4 Unexpected Reset Fetch
If an interrupt request occurs while a “POP CC” in-
struction is executed, the interrupt controller does
not recognise the source of the interrupt and, by
default, passes the RESET vector address to the
CPU.
Workaround
To solve this issue, a “POP CC” instruction must
always be preceded by a “SIM” instruction.
15.1.5 Clearing active interrupts outside
interrupt routine
When an active interrupt request occurs at the
same time as the related flag is being cleared, an
unwanted reset may occur.
Note:
clearing the related interrupt mask will not
generate an unwanted reset
Concurrent interrupt context
The symptom does not occur when the interrupts
are handled normally, i.e.
when:
– The interrupt flag is cleared within its own inter-
rupt routine
– The interrupt flag is cleared within any interrupt
routine
– The interrupt flag is cleared in any part of the
code while this interrupt is disabled
If these conditions are not met, the symptom can
be avoided by implementing the following se-
quence:
Perform SIM and RIM operation before and after
resetting an active interrupt request.
Example:
SIM
reset interrupt flag
RIM
Nested interrupt context:
The symptom does not occur when the interrupts
are handled normally, i.e.
when:
– The interrupt flag is cleared within its own inter-
rupt routine
– The interrupt flag is cleared within any interrupt
routine with higher or identical priority level
– The interrupt flag is cleared in any part of the
code while this interrupt is disabled
If these conditions are not met, the symptom can
be avoided by implementing the following se-
quence:
PUSH CC
SIM
reset interrupt flag
POP CC
15.1.6 SCI Wrong Break duration
Description
A single break character is sent by setting and re-
setting the SBK bit in the SCICR2 register. In
some cases, the break character may have a long-
er duration than expected:
- 20 bits instead of 10 bits if M=0
- 22 bits instead of 11 bits if M=1.
In the same way, as long as the SBK bit is set,
break characters are sent to the TDO pin. This
may lead to generate one break more than expect-
ed.
Occurrence
The occurrence of the problem is random and pro-
portional to the baudrate. With a transmit frequen-
cy of 19200 baud (f
CPU
=8MHz and SCI-
BRR=0xC9), the wrong break duration occurrence
is around 1%.
Workaround
If this wrong duration is not compliant with the
communication protocol in the application, soft-
ware can request that an Idle line be generated
before the break character. In this case, the break
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST72F321J7TAE | 功能描述:8位微控制器 -MCU 8B MCU 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 |
| ST72F321J7TCE | 制造商:STMicroelectronics 功能描述: |
| ST72F321J9T3 | 功能描述:8位微控制器 -MCU Flash 60K SPI/I2C/SC 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 |
| ST72F321J9T3TR | 制造商:STMicroelectronics 功能描述: |
| ST72F321J9T6 | 功能描述:8位微控制器 -MCU Flash 60K SPI/SCI/I2 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 |
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