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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
Conv ert er
LI
CVCC
CVSS
UART
Interface
TxD
RxD
16-BIT
TI MER S
T[0-1]
Interrupt
Cont roller
INT[0-1]
Alternat e
Card
CRST1
CCLK1
CIO1
3.3 V
Regulat or
VCC
VSS
WATCH-DOG
POR
PF D
RESET
RST
PLLPLLF
XT A L 1
XT A L 2
8 MHz
Oscillator
256 x 8
RAM
512 x 8
XR AM
80C51 8-BIT CORE
256 x 8
RAM
INTERNAL ADDRESS AND DATA BUS
16K x 8
ROM
Parallel I/O Port s
8-BIT
PORT
P3[0-7]
D+
D-
VREF
USB
Interface
ISO 7816
Interface
CCLK
CRST
CPRES
CC8
CC4
CI O
3.3V
Regulat or
AVSS
AVCC
DVCC
1-BIT
PORT
P5.0
LED's
LED[0-3]
3-BIT
PORT
P1[2,6-7]
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