Overview
Description
The 1339 serial real-time clock (RTC) is a low-power clock/date device with two programmable time-of-day alarms and a programmable square-wave output. Address and data are transferred serially through an I2C bus. The clock/date provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. The 1339 has a built-in power-sense circuit that detects power failures and automatically switches to the backup supply, maintaining time, date, and alarm operation.
Features
- Real-Time Clock (RTC) counts seconds, minutes, hours, day, date, month, and year with leap-year compensation valid up to 2100
- Packaged in 8-pin MSOP, 8-pin SOIC, or 16-pin SOIC (surface-mount package with an integrated crystal)
- Fast mode I2C Serial interface
- Two time-of-day alarms
- Programmable square-wave output
- Oscillator stop flag
- Automatic power-fail detect and switch circuitry
- Trickle-charge capability
- Industrial temperature range (-40 to +85°C)
- Underwriters Laboratory (UL) recognized
Comparison
Applications
Design & Development
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.
Support
Support Communities
Support Communities
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Debugging M16C/5LD - E8a stops when starting PLL
Hi all.I'm trying to run the E8a, emulating the M16C/5LD.I'm using IAR workbench and C-SPY and it's working great in all other aspects.When starting the PLL, (setting PLC0, bit 7) it all hangs.I'm using a 16MHz crystal, multiplying by ...
Apr 23, 2011 -
How to use __asm{} with C variables?
I want to use inline asm in my H8S C project. I have used gcc inline asm before so I'd like to think I know what I am doing, but even after following the manual I cannot get it to work with C variables.I am using "C/ ...
Jun 13, 2012 -
stop mode
I am a newbie to renesas and trying to understand more about stop mode functionality on R8C/35. What will happen if i execute the following instruction.inside an ISR, before REIT is executed? bset 0,0007H ; // 1->cm10 Stop modeWill the micro ever be able to ...
Jun 7, 2012