Datasheet

3
4337K–USB–04/08
AT89C5130A/31A-M
2. Block Diagram
Notes: 1. Alternate function of Port 1
2. Alternate function of Port 3
3. Alternate function of Port 4
Timer 0
INT
RAM
256x8
T0 T1
RxD TxD
WR
RD
EA
PSEN
ALE
XTAL2
XTAL1
EUART
CPU
Timer 1
INT1
Ctrl
INT0
(2)
(2)
C51
CORE
(2) (2) (2) (2)
Port 0
P0
Port 1
Port 2
Port 3
Parallel I/O Ports & Ext. Bus
P1 P2 P3
ERAM
1Kx8
PCA
RST
Watch
Dog
CEX ECI
VSS
VDD
(2)(2)
(1)(1)
Timer2
T2EX
T2
(1) (1)
Port 4
P4
16/32Kx8Flash
+
BRG
USB
D - D +
VREF
Regu-
Key
Board
KIN [0..7]
lator
AVSS
EEPROM
4Kx8
SPI
MISO MOSI SCK
(1) (1) (1)
SS
(1)
AVDD
TWI
SCL SDA
(3) (3)