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参数资料
| 型号： | DS83C530-QNL |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Microcontroller |
| 英文描述： | 8-BIT, MROM, 33 MHz, MICROCONTROLLER, PQCC52 |
| 封装： | PLASTIC, LCC-52 |
| 文件页数： | 21/45页 |
| 文件大小： | 649K |
| 代理商： | DS83C530-QNL |
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DS87C530/DS83C530 EPROM/ROM Microcontrollers with Real-Time Clock
28 of 45
TIMED-ACCESS PROTECTION
It is useful to protect certain SFR bits from an accidental write operation. The Timed-Access procedure
stops an errant CPU from accidentally changing these bits. It requires that the following instructions
precede a write of a protected bit.
MOV
0C7h, #0AAh
MOV
0C7h, #55h
Writing an AAh and then a 55h to the Timed-Access register (location C7h) opens a three-cycle window
for write access. The window allows software to modify a protected bit(s). If these instructions do not
immediately precede the write operation, then the write will not take effect. The protected bits are:
EXIF.0
BGS
Bandgap Select
WDCON.6
POR
Power-On Reset flag
WDCON.1
EWT
Enable Watchdog Reset
WDCON.0
RWT
Restart Watchdog
WDCON.3
WDIF
Watchdog Interrupt Flag
ROMSIZE.2
RMS2
ROM Size Select 2
ROMSIZE.1
RMS1
ROM Size Select 1
ROMSIZE.0
RMS0
ROM Size Select 0
TRIM.7–0
—
All RTC Trim Functions
RTCC.2
RTCWE
RTC Write Enable
RTCC.0
RTCE
RTC Oscillator Enable
EPROM PROGRAMMING
The DS87C530 follows standards for a 16kB EPROM version in the 8051 family. It is available in a UV
erasable, ceramic windowed package and in plastic packages for one-time user-programmable versions.
The part has unique signature information so programmers can support its specific EPROM options.
PROGRAMMING PROCEDURE
The DS87C530 should run from a clock speed between 4MHz and 6MHz when programmed. The
programming fixture should apply address information for each byte to the address lines and the data
value to the data lines. The control signals must be manipulated as shown in Table 9. The diagram in
Figure 5 shows the expected electrical connection for programming. Note that the programmer must
apply addresses in demultiplexed fashion to Ports 1 and 2 with data on Port 0. Waveforms and timing are
provided in the Electrical Specifications section. Program the DS87C530 as follows:
1)
Apply the address value,
2)
Apply the data value,
3)
Select the programming option from Table 9 using the control signals,
4)
Increase the voltage on VPP from 5V to 12.75V if writing to the EPROM,
5)
Pulse the
PROG signal five times for EPROM array and 25 times for encryption table, lock bits, and other
EPROM bits,
6)
Repeat as many times as necessary.
相关PDF资料 |
PDF描述 |
|---|---|
| DS87C530-QNL | 8-BIT, OTPROM, 33 MHz, MICROCONTROLLER, PQCC52 |
| DS83C530-QCL | 8-BIT, MROM, 33 MHz, MICROCONTROLLER, PQCC52 |
| DS87C530-KCL | 8-BIT, OTPROM, 33 MHz, MICROCONTROLLER, CQCC52 |
| DTA-03D-1.5-TA-P | POSITION, LINEAR SENSOR-AC, -3-3mm |
| DTA-01D-3-SA-P | POSITION, LINEAR SENSOR-AC, -1-1mm |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS83C530-QNL+ | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:EPROM/ROM Microcontrollers with Real-Time Clock |
| DS83CH20 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Peripheral (Multifunction) Controller |
| DS84 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| DS840 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| DS843 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
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