Philips P89LPC903 ユーザーズマニュアル

Philips

Philips Semiconductors

User’s Manual - Preliminary -

P89LPC901/902/903

Table of Contents

3

Mode 6 - P89LPC901 .............................................................................. 47
Timer Overflow toggle output - P89LPC901 ............................................ 49

6. Real-Time Clock/System Timer............................................................ 51

Real-time Clock Source ...........................................................................  51
Changing RTCS1-0 .................................................................................  53
Real-time Clock Interrupt/Wake Up .........................................................  53
Reset Sources Affecting the Real-time Clock..........................................  53

7. Power Monitoring Functions ................................................................. 55

Brownout Detection .................................................................................  55
Power-On Detection ................................................................................  56
Power Reduction Modes..........................................................................  57

8. UART (P89LPC903) ............................................................................. 61

Mode 0.....................................................................................................  61
Mode 1.....................................................................................................  61
Mode 2.....................................................................................................  61
Mode 3.....................................................................................................  61
SFR Space ..............................................................................................  62
Baud Rate Generator and Selection........................................................  62
Updating the BRGR1 and BRGR0 SFRs.................................................  62
Framing Error...........................................................................................  63
Break Detect ............................................................................................  63
More About UART Mode 0 ......................................................................  65
More About UART Mode 1 ......................................................................  66
More About UART Modes 2 and 3...........................................................  67
Framing Error and RI in Modes 2 and 3 with SM2 = 1 ............................  67
Break Detect ............................................................................................  67
Double Buffering ......................................................................................  68
Double Buffering in Different Modes........................................................  68
Transmit Interrupts with Double Buffering Enabled (Modes 1, 2 and 3) ..  68
The 9th Bit (Bit 8) in Double Buffering (Modes 1, 2 and 3) ......................  69
Multiprocessor Communications..............................................................  70
Automatic Address Recognition...............................................................  70

9. Reset .................................................................................................... 73

Power-On reset code execution .............................................................. 73

10. Analog Comparators........................................................................... 75

Comparator Configuration .......................................................................  75
Internal Reference Voltage ......................................................................  77
Comparator Interrupt ...............................................................................  77
Comparator and Power Reduction Modes...............................................  78
Comparator Configuration Example ........................................................  78

11. Keypad Interrupt (KBI)........................................................................ 79
12. Watchdog Timer ................................................................................. 83

Watchdog Function.................................................................................. 83