at89c5131 ATMEL Corporation, at89c5131 Datasheet - Page 174

• Manufacturer Part Number: at89c5131
• Description: 8-bit Flash Microcontroller With Full Speed Usb Device At89c5131
• Manufacturer: ATMEL Corporation

ii
On-chip Expanded RAM (ERAM) ....................................................... 46
Timer 2 ................................................................................................. 49
Programmable Counter Array (PCA) ................................................ 54
Serial I/O Port ...................................................................................... 65
Interrupt System ................................................................................. 75
Keyboard Interface ............................................................................. 84
Programmable LED ............................................................................ 88
Serial Peripheral Interface (SPI) ........................................................ 89
Two Wire Interface (TWI) .................................................................... 98
Application-Programming-Interface .................................................................... 44
XROW Bytes....................................................................................................... 44
Hardware Conditions .......................................................................................... 44
Hardware Security Byte ...................................................................................... 45
Auto-reload Mode ............................................................................................... 49
Programmable Clock Output .............................................................................. 50
PCA Capture Mode............................................................................................. 61
16-bit Software Timer/Compare Mode................................................................ 61
High Speed Output Mode ................................................................................... 62
Pulse Width Modulator Mode.............................................................................. 63
PCA Watchdog Timer ......................................................................................... 64
Framing Error Detection ..................................................................................... 65
Automatic Address Recognition.......................................................................... 66
Baud Rate Selection for UART for Mode 1 and 3............................................... 68
UART Registers.................................................................................................. 71
Overview............................................................................................................. 75
Registers............................................................................................................. 76
Interrupt Sources and Vector Addresses.............................................................83
Introduction ......................................................................................................... 84
Description.......................................................................................................... 84
Registers............................................................................................................. 85
Features.............................................................................................................. 89
Signal Description............................................................................................... 89
Functional Description ........................................................................................ 91
Introduction ......................................................................................................... 98
Description........................................................................................................ 100
Notes ................................................................................................................ 103
Registers............................................................................................................112
4136C–USB–04/05