at89c5131 ATMEL Corporation, at89c5131 Datasheet - Page 3

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

Block Diagram
Notes:
4136C–USB–04/05
1. Alternate function of Port 1
2. Alternate function of Port 3
3. Alternate function of Port 4
XTAL1
XTAL2
PSEN
ALE
WR
RD
EA
(2)
(2)
CPU
(2) (2)
(2)
Timer 0
Timer 1
EUART
BRG
(2)
+
CORE
C51
(2) (2)
256x8
RAM
Ctrl
INT
32Kx8 Flash
Port 0Port 1 Port 2 Port 3
Parallel I/O Ports & Ext. Bus
EEPROM
4Kx8
Port 4
ERAM
1Kx8
(1)
(1)
PCA
Board
Key
(1) (1)
Timer2
Watch
Dog
TWI
USB
(1) (1) (1) (1)
Regu-
AT89C5131
lator
SPI
VREF
3