Block Diagram
AT89C5130A/31A-M
XTAL1
XTAL2
ALE
PSEN
EA
RD (2)
WR (2)
(2) (2)
(1) (1) (1) (1) (3) (3) (1) (1) (1) (1)
EEPROM ERAM
EUART
+
BRG
RAM 16/32Kx8Flash
256x8
4Kx8
1Kx8
PCA Timer2 TWI
SPI
CPU
C51
CORE
Timer 0 INT
Timer 1 Ctrl
Parallel I/O Ports & Ext. Bus
Port 0Port 1 Port 2 Port 3 Port 4
(2) (2) (2) (2)
Key
Board
Watch
Dog
USB
Regu-
lator
VREF
Notes: 1. Alternate function of Port 1
2. Alternate function of Port 3
3. Alternate function of Port 4
3
4337C–USB–02/05