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參數(shù)資料
| 型號(hào)： | PCD3327U |
| 英文描述： | Pulse Telephone Dialer |
| 中文描述： | 脈沖電話撥號(hào)器 |
| 文件頁數(shù)： | 12/36頁 |
| 文件大小： | 169K |
| 代理商： | PCD3327U |
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1999 Oct 28
12
Philips Semiconductors
Product specification
8-bit microcontrollers with DTMF generator
and 128 bytes EEPROM
PCA3351C; 52C; 53C;
PCD3351A; 52A; 53A
7
EEPROM AND TIMER 2 ORGANIZATION
The PCD335xA and PCA335xC have 128 bytes of
Electrically Erasable Programmable Read-Only Memory
(EEPROM). Such non-volatile storage provides data
retention without the need for battery backup. In telecom
applications, the EEPROM is used for storing redial
numbers and for short dialling of frequently used numbers.
More generally, EEPROM may be used for customizing
microcontrollers, such as to include a PIN code or a
country code, to define trimming parameters, to select
application features from the range stored in ROM.
The most significant difference between a RAM and an
EEPROM is that a bit in EEPROM, once written to a
logic 1, cannot be cleared by a subsequent write
operation. Successive write accesses actually perform a
logical OR with the previously stored information.
Therefore, to clear a bit, the whole byte must be erased
and re-written with the particular bit cleared. Thus, an
erase-and-write operation is the EEPROM equivalent of a
RAM write operation
Whereas read access times to an EEPROM are
comparable to RAM access times, write and erase access
times are much slower at 5 ms each. To make these
operations more efficient, several provisions are available
in the PCD335xA and PCA335xC.
First, the EEPROM array is structured into 32 four-byte
pages (see Fig.5) permitting access to 4 bytes in parallel
(write page, erase/write page and erase page). It is also
possible to erase and write individual bytes. Finally, the
EEPROM address register provides auto-incrementing,
allowing very efficient read and write accesses to
sequential bytes.
To simplify the erase and write timing, the derivative 8-bit
down-counter (Timer 2) with reload register is provided.
In addition to EEPROM timing, Timer 2 can be used for
general real-time tasks, such as for measuring signal
duration and for defining pulse widths.
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| PCD3331-1P | Telecommunication IC |
| PCD3331-1T | Telecommunication IC |
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| PCD3353CT | 8-BIT MICROCONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| PCD332XCFAMILY | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Pulse Telephone Dialer |
| PCD3330-1 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard repertory dialler/ringer with EEPROM |
| PCD3330-1D-T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Tone/Pulse Telephone Dialer |
| PCD3330-1P | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard repertory dialler/ringer with EEPROM |
| PCD3330-1T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard repertory dialler/ringer with EEPROM |
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