Remote-processing RPC-210 Manual do Utilizador Página 35
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REAL TIME CLOCK BASIC SECTION 7
Page 7-1
INTRODUCTION
REAL TIME CLOCK SECTION 7
A real time clock (RTC) incorporates an industry
standard DS1287 with several enhanced features. Of
note, these are a unique serial number, century register,
power elapsed timers, and power cycle counter.
The RT C is batter y backed and also backs up RAM in
U4. An additional 114 bytes of RAM are available in the
clock chip itself.
The clock can generate an interrupt or wake up the CPU
from low power mode at periodic time intervals or
preset time.
This section of the man ual addre sses many of the parts
features and capabilities. However, not all are
discussed. Review the data sheet, 1689-93. PDF , for
more information.
ADDRESSING
The RT C' s base addr ess is 0A100H. The par t is
accessed using the LINEB commands and. Clock
registers are accessed by adding 0A100H to the addr ess
shown in the data sheet.
Review the application programs in the BASIC52
subdirectory for programming examples. RTC-1.BAS
accesses most all functions. It also has subroutines for
formatting data.
Note that there are two register banks in this chip. Both
banks allow access to timekeeping, control, and some
RAM . Bank 0 has an additional 64 bytes of RAM while
bank 1 has serial number, extended control, and other
timers. Bank control is through register A, bit 4. See
page 10 of the 1689-93.PDF file for register A
information.
PROGRAMMING NOTES
The optional RTC oscillator is turned off and date, time,
and counters are reset to zero as shipped from the
factory. This is to conserve battery power.
The DS1689 re al time clock has sever al register s used to
control and access var ious functions and capabilities.
The data sheet, 1689-93.PDF, has much more
information.
This section describes some of the more commonly used
capabilities of the clock.
The cr ystal used is 12. 5 pf. Bit 5 must be set in
extended control register 4B. This bit is set in
RTC-1. BAS demonstration program at line 1000.
SETTING DATE AND TIME
Date and time are set while running a program or in the
immediate m ode. D ate and time are treated as numbers,
not strings. To set date and time:
DATE 0,1,5
TIME 13,23,43
Date is January 5, 2000. Time is set to 1:23:43 PM.
The clock has a century counter loca ted at I/O addr ess
0a148h. It is in the clock’s exte nded re gister bank . This
byte may be set or read.
Date and time are set in RTC-1.BAS.
Daylight savings time adjustment
The RTC may be program med for automatic daylight
savings time correction. When bit 0 in register B (at
address 0A10BH) is set, the hour advances at the
appropriate time on the first S unday in A pril and falls
back on the last Sunday in October. See 1689-93.PDF
data sheet, page 11 for more information.
BATTERY LIFE
The batter y included on tw o RPC -210 ver sions is, in
theory, good for 10 years of power off backup. 1 In
practice, you will achieve less than 4 to 6 years of life.
This is true of any lithium button cell. Factors that
cause life to decrease are elevated temperatures, high
and low humidity. A batteries' self discharge doubles
when its environment temperature changes from 25/C to
50/C. This alone r educes battery life fr om 10 ye ars to
5. Lower temperatures reduce self discharge rate.
Low humidity pr omotes the evapor ation of electr olyte
from the battery. H igh humidity helps dischar ge it.
If battery life is not long enough you can remove the
existing battery and replace it with a 3V lithium type. A
Tadiran
1
model TL-5276/SL is a utility meter battery and
will, in theory, pr ovide backup for over 100 year s.
Battery current is about 5 micro-amps with board power
off.
- TRADEMARKS 1
- NOTICE TO USER 1
- FCC NOTICE 1
- TABLE OF CONTENTS 2
- OVERVIEW SECTION 1 4
- SETUP AND OPERATION SECTION 2 10
- INTRODUCTION 14
- SAVING A PROGRAM 14
- HIDING A PROGRAM 15
- WARNING: 15
- AUTORUNNING 15
- LOADING A PROGRAM 15
- SAVING AND READING DATA 16
- ASSEMBLY LANGUAGE INTERFACE 16
- SETTING FLASH SIZE 17
- COMMANDS 17
- APPLICATION PROGRAMS 18
- DESCRIPTION 19
- COM0 SERIAL PORT 19
- COM1 SERIAL PORT 20
- USING RADIO MODEMS 23
- ACCESSING SERIAL BUFFERS 23
- ACCESSING COM0 AND COM1 23
- DISABLING CONTROL-C 23
- SPI PORT 24
- RS-232 PORT PIN OUT 25
- RS-422/485 PORT PIN OUT 25
- RAM BASIC SECTION 5 26
- DIGITAL LINES BASIC SECTION 6 29
- ADDRESSING 35
- PROGRAMMING NOTES 35
- SETTING DATE AND TIME 35
- BATTERY LIFE 35
- STABILITY AND TEMPERATURE 36
- IDLE AND POWER DOWN MODES 36
- SQUARE WAVE OUTPUT 37
- READING CLOCK SERIAL NUMBER 37
- PROGRAMMABLE INTERRUPTS 37
- COUNTER/ENCODER 38
- J11 CONNECTOR PIN OUT 38
- PULSE OUTPUTS 38
- USING INTERRUPT 0 39
- PULSE WIDTH & FREQUENCY 39
- MEASUREMENT 39
- EXTERNAL INTERRUPTS SECTION 9 41
- ANALOG I/O BASIC SECTION 10 43
- CONNECTING DISPLAYS 49
- WRITING TO THE DISPLAY 49
- USING “UNSUPPORTED” DISPLAYS 50
- DISPLAY PIN OUTS 50
- CONTRAST/ANGLE ADJUSTMENT 50
- DISPLAY CONNECTOR PIN OUT 51
- DEMONSTRATION PROGRAMS 51
- EXPANSION PORT 52
- EXTERNAL POWER 52
- LOW POWER MODES 53
- Expansion Port Pin Out 53
- USING J7 FOR I/O 54
- RESOURCES SECTION 14 55
- MECHANICAL 58
- SHOCK AND VIBRATION 58
- MOUNTING TO A MOTHER BOARD 59
- CONNECTOR POSITION 60
- BOARD DIMENSION 60
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