T89C5121-ICUIL Atmel, T89C5121-ICUIL Datasheet - Page 30

• Manufacturer Part Number: T89C5121-ICUIL
• Description: IC 8051 MCU W/SMART CARD 24SSOP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of T89C5121-ICUIL

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SmartCard, UART/USART
• Peripherals: LED, POR, WDT
• Number Of I /o: 14
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: Flash RAM
• Eeprom Size: 16K x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.85 V ~ 5.4 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 24-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -
• Other names: Q1468934; T89C5121-ICSIL; T89C5121-ICSIL

Block Diagram
Functional Description
Barrel Shifter
SCART FSM
30
A/T8xC5121
The Smart Card Interface Block diagram is shown in Figure 14.
Figure 14. SCIB Block Diagram
The architecture of the Smart Card Interface Block is detailed below.
It allows the translation between 1 bit serial data and 8 bits parallel data.
The barrel function is useful for character repetition since the character is still present in
the shifter at the end of the character transmission.
This shifter is able to shift the data in both directions and to invert the input or output
value in order to manage both direct and inverse ISO7816-3 convention.
Coupled with the barrel shifter there is a parity checker and generator.
There are 2 registers connected to this barrel shifter, one for the transmission and one
for the reception.
They act as buffers to relieve the CPU of timing constraints.
(Smart Card Asynchronous Receiver Transmitter Finite State Machine)
This is the core of the design. Its purpose is to control the barrel shifter. To sequence
correctly the barrel shifter for a reception or a transmission, it uses the signals issued by
Clk_iso
Clk_cpu
INT
Waiting time
counter
Guard time
counter
Interrupt generator
Etu counter
SCI Registers
Barrel shifter
Scart
fsm
Power on
Power off
fsm
I/O
mux
4164G–SCR–07/06
IO (in)
IO (out)
CLK
RST
C4 (out)
C8 (out)
CLK1
C4 (in)
C8 (in)
VCARD