Philips P89LPC908 用户手册

Philips

Philips Semiconductors

User’s Manual - Preliminary -

P89LPC906/907/908

Table of Contents

2

1. General Description................................................................................ 7

Pin Configurations .....................................................................................  7
Product comparison...................................................................................  8
Pin Descriptions - P89LPC906  ................................................................ 12
Pin Descriptions - P89LPC907  ................................................................ 13
Pin Descriptions - P89LPC908  ................................................................ 14
Special function registers ......................................................................... 15
Memory Organization ..............................................................................  24

2. Clocks................................................................................................... 25

Enhanced CPU ........................................................................................  25
Clock Definitions ......................................................................................  25
CPU Clock (OSCCLK) .............................................................................  25
Low Speed Oscillator Option - P89LPC906.............................................  25
Medium Speed Oscillator Option - P89LPC906 ......................................  25
High Speed Oscillator Option - P89LPC906............................................  25
Oscillator Option Selection- P89LPC906.................................................  26
Clock Output - P89LPC906 .....................................................................  26
On-Chip RC oscillator Option ..................................................................  26
If CCLK is 8MH or slower, the CLKLP SFR bit (AUXR1.7) can be set to ’1’ to re-

duce power consumption. On reset, CLKLP is ’0’ allowing highest performance access. This bit
can then be set in software if CCLK is running at 8MHz or slower ............................... 26

Watchdog Oscillator Option .....................................................................  26
External Clock Input Option - P89LPC906 ..............................................  27
CPU Clock (CCLK) Wakeup Delay..........................................................  27
CPU Clock (CCLK) Modification: DIVM Register.....................................  27
Low Power Select (P89LPC906) ...........................................................  28

................................................................................................................. 29

3. Interrupts .............................................................................................. 31

Interrupt Priority Structure........................................................................  31
External Interrupt Inputs ..........................................................................  32
External Interrupt Pin Glitch Suppression................................................  32

4. I/O Ports ............................................................................................... 35

Port Configurations ..................................................................................  35
Quasi-Bidirectional Output Configuration ................................................  35
Open Drain Output Configuration ............................................................  36
Input-Only Configuration..........................................................................  37
Push-Pull Output Configuration ...............................................................  37
Port 0 Analog Functions ..........................................................................  37

5. Timers 0 and 1...................................................................................... 41

Mode 0.....................................................................................................  42
Mode 2.....................................................................................................  42
Mode 3.....................................................................................................  43
Mode 6 - P89LPC907 ..............................................................................  43
Timer Overflow toggle output - P89LPC907 ............................................  45