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參數(shù)資料
| 型號(hào)： | PCD3350AH |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-bit microcontroller with DTMF generator, 256 bytes EEPROM and real-time clock |
| 中文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | 14 X 14 X 2.20 MM, PLASTIC, QFP-44 |
| 文件頁數(shù)： | 18/36頁 |
| 文件大?。?/td> | 204K |
| 代理商： | PCD3350AH |
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1996 Dec 18
18
Philips Semiconductors
Product specification
8-bit microcontroller with DTMF generator,
256 bytes EEPROM and real-time clock
PCD3350A
8
REAL-TIME CLOCK
The Real Time Clock (RTC) consists of a 32 kHz crystal
oscillator, a 32 kHz to 1 second or 1 minute divider chain,
an 8-bit Frequency Adjustment Register and the Clock
Control Register. The complete RTC section works
independently of the microcontroller status, even in Idle
and Stop mode.
8.1
Oscillator
The internal 32 kHz oscillator needs an external quartz
crystal with a frequency of 32768.00 Hz (a positive
deviation up to +259
×
10
6
is allowed) and an external
feedback resistor between pins RTC1 and RTC2; 4.7 M
is recommended. It is controlled by the RUN-bit in the
Clock Control Register.
8.2
Divider chain
The divider chain operates with the 32 kHz oscillator
output and divides this signal down to two clocks with a
period of 1 second or 1 minute. Depending on bit ITS in the
Clock Control Register, the falling edge of the seconds or
minutes clock is used to set the Clock Interrupt Flag (CIF)
in the Clock Control Register.
Since the clock interrupt is used to let the microcontroller
leave the Stop mode, it is ORed to the external interrupt
(CE/T0) and has the same functionality, e.g. it must be
enabled in the Clock Control Register (bit ECI) and by
execution of the instruction ‘EN I’. The clock interrupt will
then be treated as an external interrupt.
Additionally, the divider chain generates a 16 kHz clock
(RCO) that can be routed through derivative port line
DP0.0/RCO, controlled by bit ERCO in the Clock Control
Register.
8.3
Frequency adjustment
The frequency adjustment is used to extend the interrupt
time by defining the number of 16 kHz clocks in the
Frequency Adjustment Register that will be counted twice
within the first second period after a minute interrupt.
If the second interrupt is used (ITS = 1), every 60
th
interval
may be up to 15.3 ms longer than the others as a result of
the frequency adjustment. The adjusted Minute Interrupt
Time (MIT) now shows a maximum deviation of 0.5
×
10
6
.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PCD3350A | 8-bit microcontroller with DTMF generator, 256 bytes EEPROM and real-time clock |
| PCD3353AH | 8-bit microcontrollers with DTMF generator and 128 bytes EEPROM |
| PCA3351CP | 8-bit microcontrollers with DTMF generator and 128 bytes EEPROM |
| PCA3352C | 8-bit microcontrollers with DTMF generator and 128 bytes EEPROM |
| PCA3352CT | 8-bit microcontrollers with DTMF generator and 128 bytes EEPROM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCD3351A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontrollers with DTMF generator and 128 bytes EEPROM |
| PCD3351AH | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| PCD3351AP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontrollers with DTMF generator and 128 bytes EEPROM |
| PCD3351CP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| PCD3351CT | 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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