NXP Semiconductors |
|
|
|
|
| UM10301 | |
|
|
|
|
| User Manual PCF85x3, PCA8565 and PCF2123, PCA2125 | ||
| Table 5. | Setting the time and date |
|
| |||
| Sequence of commands / data to be sent |
|
| ||||
| Binary (BCD) | HEX | Register |
| Comments | ||
|
|
|
|
| Address |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| generate I2C start condition |
|
|
|
|
|
| I2C slave address, write | |
1 0 1 0 | 0 0 1 0 | A2 |
|
| |||
|
|
|
|
|
|
| |
0 0 0 0 | 0 0 0 0 | 00 |
|
| word address 0, next bytes are data | ||
|
|
|
|
|
|
| |
0 0 0 0 | 0 0 0 0 | 00 | 00 |
| control/status 1, no test modes or POR override | ||
|
|
|
|
|
|
| |
0 0 0 0 | 0 0 0 0 | 00 | 01 |
| control/status 2, no alarm/timer flags or interrupts | ||
|
|
|
|
|
|
| |
0 0 0 0 | 0 0 0 0 | 00 | 02 |
| set seconds, clear voltage low detector | ||
|
|
|
|
|
|
| |
0 1 0 0 | 0 1 0 1 | 45 | 03 |
| set minutes to 45 | ||
|
|
|
|
|
|
| |
0 0 0 1 | 0 1 0 0 | 14 | 04 |
| set hours to 14 | ||
|
|
|
|
|
|
| |
0 0 0 1 | 0 1 1 0 | 16 | 05 |
| set days to 16 | ||
|
|
|
|
|
|
| |
0 0 0 0 | 0 1 0 1 | 05 | 06 |
| set weekdays to Friday, Monday is day 1 | ||
|
|
|
|
|
|
| |
1 0 0 0 | 0 1 1 1 | 87 | 07 |
| set month to 7 and century bit to 1 | ||
|
|
|
|
|
|
| |
0 0 0 0 | 1 0 0 0 | 08 | 08 |
| set years to 08 | ||
|
|
|
|
|
|
| |
1 0 0 0 | 0 0 0 0 | 80 | 09 |
| disable minute alarm and reset to 00 | ||
|
|
|
|
|
|
| |
1 0 0 0 | 0 0 0 0 | 80 | 0A |
| disable hour alarm and reset to 00 | ||
|
|
|
|
|
|
| |
1 0 0 0 | 0 0 0 0 | 80 | 0B |
| disable day alarm and reset to 00 | ||
|
|
|
|
|
|
| |
1 0 0 0 | 0 0 0 0 | 80 | 0C |
| disable weekday alarm and reset to 00 | ||
|
|
|
|
|
|
| |
1 0 0 0 | 0 0 0 0 | 80 | 0D |
| set frequency out to 32768 Hz e.g. for tuning | ||
|
|
|
|
|
|
| |
0 0 0 0 | 0 0 0 0 | 00 | 0E |
| timer switched off | ||
|
|
|
|
|
|
| generate I2C stop condition |
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
12.2 Alarm
It is possible to program several types of alarm. Let’s take the example to set an alarm such that always 15 minutes past the hour the alarm flag AF is set and an interrupt generated.
Table 6. Setting the alarm
Sequence of commands / data to be sent
| Binary (BCD) | HEX | Register |
| Comments |
|
|
|
| Address |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| generate I2C start condition |
|
|
|
|
|
| I2C slave address, write |
|
1 0 1 0 0 0 1 0 | A2 |
|
|
| ||
|
|
|
|
|
|
|
UM10301_1 |
|
|
|
| © NXP B.V. 2008. All rights reserved. | |
User manual | Rev. 01 — 23 December 2008 | 27 of 52 | ||||
