73S1209F-44IM/F Maxim Integrated Products, 73S1209F-44IM/F Datasheet - Page 67

• Manufacturer Part Number: 73S1209F-44IM/F
• Description: IC SMART CARD READER 44-QFN
• Manufacturer: Maxim Integrated Products

Specifications of 73S1209F-44IM/F

• Core Processor: 80515
• Core Size: 8-Bit
• Speed: 24MHz
• Connectivity: I²C, SmartCard, UART/USART
• Peripherals: LED, POR, WDT
• Number Of I /o: 9
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

UG_12xxF_016
4.2.17 Boot Loader and Passcode Management – Available with the LAPI-*BL.lib Only
The Boot Loader code occupies the first (lower) 512 bytes of the Flash program space (0x0000 - 0x01FF)
including the passcode storage space. The Boot Loader assumes that the CPU is running at the default
clock rate which is 3.69 MHz. As a result, the serial baud rate and all soft-timers (timer 0) are calculated
based on the default CPU clock rate. The Boot Loader also only accepts Intel Hex files via the Serial
RS-232 interface. The Boot Loader and Passcode Management API include:
•
•
•
For security and authorization enforcement, the passcode is implemented, embedded and validated
within the Boot Loader code. The Boot Loader will return a hardware error if Security Mode 0 or Security
Mode 1 has already been enabled.
The Passcode is a 2-byte integer data type where the second byte is the complement of the first byte.
After validating the Passcode, the LAPI will configure the device’s serial interface to be running at 115200
baud with 8 data bits, No stop bit and Xon/Xoff control enabled. It then waits for a valid Intel hex
record from the Serial RS-232 interface. The record’s checksum is checked along with its Flash address
location. The Boot Loader code area (the first page of Flash – 512 bytes at address 0x0000 – 0x01FF)
will be protected. Any hex record with addresses on the first page will be ignored. Once a valid hex
record is accepted by the device, all Flash space (except for the Boot Loader area) will be permanently
erased. For each successful hex record received by the device, the device will respond with a ‘P’. For
each failed hex record received by the device (bad CRC), the device will respond with an ‘F’. When the
device receives the last successful hex record and if there is no error, the device will immediately jump to
the start of the new application. For a sample of the usage of the Boot Loader API, review the
Pseudo-CCID application code (built and shipped in a separate TSC 73S12xxF PCCID Serial release).
Figure 10
Rev. 1.50
Boot()
CheckPassCode ()
SetPassCode ( )
resend the record,
send next record
Flash
Down
If response = 'F'
Invoke the Boot
Load
Start
ifresponse = 'P'
Loader Code
illustrates the Flash Download and Flash Programming process.
(page 68)
Application
Layer
(page 69)
(page 68)
Figure 9: Boot Loader Scenario
Figure 9
depicts a successful Boot Loader scenario.
73S12xxF Software User Guide
LAPI
Validate PassCode
Intel hex record
and wait for
Flash
Prog.
Start
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