
3
AT89C5131
4136A–USB–03/03
Block Diagram
Notes: 1. Alternate function of Port 1
2. Alternate function of Port 3
3. Alternate function of Port 4 (Alternate function of Port 4 on PLCC52, under evaluation)
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
XRAM
1Kx8
PCA
RST
Watch
Dog
CEX
ECI
VSS
VDD
(2)(2)
(1)(1)
Timer2
T2EX
T2
(1)
(1)
Port 4
P4
32Kx8 Flash
+
BRG
USB
D -
D +
VREF
Regu-
Key
Board
KIN
lator
AVSS
EEPROM
4Kx8
SPI
MISO
MOSI
SCK
(1) (1) (1)
SS
(1)
AVDD
Komentáře k této Příručce