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參數(shù)資料
| 型號(hào)： | ST72F324BJ6B6 |
| 廠商： | STMICROELECTRONICS |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP42 |
| 封裝： | 0.600 INCH, SHRINK, PLASTIC, DIP-42 |
| 文件頁(yè)數(shù)： | 17/188頁(yè) |
| 文件大?。?/td> | 2867K |
| 代理商： | ST72F324BJ6B6 |
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ST72324B
On-chip peripherals
113/188
Even parity
The parity bit is calculated to obtain an even number of ‘1’s inside the frame made of the 7 or
8 LSB bits (depending on whether M is equal to 0 or 1) and the parity bit, for example,
data = 00110101; 4 bits set => Parity bit will be 0 if Even parity is selected (PS bit = 0).
Odd parity
The parity bit is calculated to obtain an odd number of ‘1’s inside the frame made of the 7 or
8 LSB bits (depending on whether M is equal to 0 or 1) and the parity bit, for example,
data = 00110101; 4 bits set => Parity bit will be 1 if Odd parity is selected (PS bit = 1).
Transmission mode
If the PCE bit is set then the MSB bit of the data written in the data register is not transmitted
but is changed by the parity bit.
Reception mode
If the PCE bit is set then the interface checks if the received data byte has an even number
of ‘1’s if even parity is selected (PS = 0) or an odd number of ‘1’s if odd parity is selected
(PS = 1). If the parity check fails, the PE flag is set in the SCISR register and an interrupt is
generated if PIE is set in the SCICR1 register.
SCI clock tolerance
During reception, each bit is sampled 16 times. The majority of the 8th, 9th and 10th
samples is considered as the bit value. For a valid bit detection, all the three samples should
have the same value otherwise the noise flag (NF) is set. For example: If the 8th, 9th and
10th samples are 0, 1 and 1 respectively, then the bit value will be ‘1’, but the Noise flag bit
is set because the three samples values are not the same.
Consequently, the bit length must be long enough so that the 8th, 9th and 10th samples
have the desired bit value. This means the clock frequency should not vary more than 6/16
(37.5%) within one bit. The sampling clock is resynchronized at each start bit, so that when
receiving 10 bits (one start bit, 1 data byte, 1 stop bit), the clock deviation must not exceed
3.75%.
Note:
The internal sampling clock of the microcontroller samples the pin value on every falling
edge. Therefore, the internal sampling clock and the time the application expects the
sampling to take place may be out of sync. For example: If the baud rate is 15.625 kbaud (bit
length is 64s), then the 8th, 9th and 10th samples will be at 28s, 32s and 36s
respectively (the first sample starting ideally at 0s). But if the falling edge of the internal
clock occurs just before the pin value changes, the samples would then be out of sync by
~4s. This means the entire bit length must be at least 40s (36s for the 10th sample + 4s
for synchronization with the internal sampling clock).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST72F324BK6T6 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32 |
| ST72F324BK4T6 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32 |
| ST72F324BJ4B5 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP42 |
| ST72F324BJ2B5 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP42 |
| ST72F324BJ4B6 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP42 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST72F324BJ6T3 | 功能描述:8位微控制器 -MCU ST72324B 5V RANGE 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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 |
| ST72F324BJ6T6 | 功能描述:8位微控制器 -MCU 8-BIT MCU W/ 8-32K Flash/ROM ADC 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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 |
| ST72F324BJ6T6TR | 功能描述:8位微控制器 -MCU 5V RANGE 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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 |
| ST72F324BJ6TAE | 功能描述:8位微控制器 -MCU 8B MCU 3.8 to 5.5V 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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 |
| ST72F324BJ6TAS | 制造商:STMicroelectronics 功能描述:MCU 8-bit ST7 CISC 32KB Flash 5V 44-Pin LQFP Tray |
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