Rainbow Electronics AT83C5127 - Manual (Page 2)

2
AT83C5127
7519A–SCR–04/05
Product description AT83C5127 product is high-performance CMOS derivatives of the 80C51 8-bit micro-
controllers designed for USB smart card reader applications.
The AT83C5127 is a low pin count of the AT8xC5122 and is proposed in ROM version.
The ROM device is only factory programmable.
Block Diagram
DC/DC
Converter
LI CV
C
C
C
VSS
UART
Interface
Tx
D
Rx
D
16-BIT
TIMERS
T
[0-
1]
Interrupt
Controller
IN
T
[0-
1]
Alternate
Card
CRS
T1
CCL
K
1
CIO
1
3.3 V
Regulator
VC
C
VS
S
WATCH-DOG
POR
PFD
RESET
RST
PLL PLLF
XTAL1
XTAL2 8 MHz
Oscillator
256 x 8
RAM
512 x 8
XRAM
80
C
51
8-
BI
T
CO
R
E
256 x 8
RAM
INTERNAL ADDRESS AND DATA BUS
16K x 8
ROM
Parallel I/O Ports
8-BIT
PORT
P3[
0
-7]
D+ D-
VR
EF
USB
Interface
IS
O 78
16
In
te
rf
a
ce
CCLK
CRST
CPRES
CC8
CC4
CIO
3.3V
Regulator
AV
SS
AV
C
C
DV
CC
1-BIT
PORT
P5
.0
LED's
LE
D
[0-
3]
3-BIT
PORT
P
1
[2
,6
-7
]