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参数资料
| 型号： | ST72P63BE6M1 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO24 |
| 封装： | 0.300 INCH, ROHS COMPLIANT, PLASTIC, SOP-24 |
| 文件页数： | 49/145页 |
| 文件大小： | 2984K |
| 代理商： | ST72P63BE6M1 |
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ST7263BDx ST7263BHx ST7263BKx ST7263BE
142/145
17 Known limitations
17.1 PA2 limitation with OCMP1 enabled
Description
This limitation affects only Rev B Flash devices
(with Internal Sales Type 72F63Bxxxxx$x7); it has
been corrected in Rev W Flash devices (with Inter-
nal Sales Type 72F63Bxxxxx$x9).
Note: Refer to Figure 83 on page 143
When Output Compare 1 function (OCMP1) on pin
PA6 is enabled by setting the OC1E bit in the
TCR2 register, pin PA2 is also affected.
In particular, PA2 is switched to its alternate func-
tion mode, SCL. As a consequence, the PA2 pin is
forced to be floating (steady level of I2C clock)
even if port configuration (PADDR+PADR) has set
it as output low. However, it can be still used as an
input or can be controlled by the I2C cell when en-
abled (where I2C is available).
17.2 Unexpected reset fetch
Description
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.
17.3 USB behavior with LVD disabled
Description
On 4K and 8K ROM devices (ST7263BK1M1,
ST72BK2M1, ST7263BKB1, ST7263BK2B1 only)
if the LVD is disabled, the USB is disabled by hard-
ware. So, the LVD is forced by ST to 0 (LVD ena-
bled). Refer to the ST7263B option list for details.
17.4 I2C multimaster
Description
In multimaster configurations, if the ST7 I2C re-
ceives a START condition from another I2C mas-
ter after the START bit is set in the I2CCR register
and before the START condition is generated by
the ST7 I2C, it may ignore the START condition
from the other I2C master. In this case, the ST7
master will receive a NACK from the other device.
On reception of the NACK, ST7 can send a re-start
and Slave address to re-initiate communication
17.5 Halt mode power consumption with ADC
on
Description
If the A/D converter is being used when Halt mode
is entered, the power consumption in Halt mode
may exceed the maximum specified in the datash-
eet.
Workaround
Switch off the ADC by software (ADON=0) before
executing a HALT instruction.
17.6 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 generate one break more than expected.
Occurrence
The occurrence of the problem is random and pro-
portional to the baudrate. With a transmit frequen-
cy
of
19200
baud
(fCPU=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
duration is always correct assuming the applica-
tion is not doing anything between the idle and the
break. This can be ensured by temporarily disa-
bling interrupts.
The exact sequence is:
- Disable interrupts
- Reset and Set TE (IDLE request)
- Set and Reset SBK (Break Request)
- Re-enable interrupts
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相关代理商/技术参数 |
参数描述 |
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| ST72T101G1B6 | 功能描述:8位微控制器 -MCU OTP EPROM 4K SPI RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| ST72T101G1M6 | 功能描述:8位微控制器 -MCU OTP EPROM 4K SPI RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
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