73S1209F-44IM/F Maxim Integrated Products, 73S1209F-44IM/F Datasheet - Page 51

• 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
4.2.8 Clock Generator Circuit API – Available with all 73S12xxF Devices
The Clock Generator API configures the system clock speed.
CPU_Select()
Some CPU speeds will limit the number of Serial baud rates supported.
supported by specific CPU clock rates.
//Can only support these rates when the CPU is running at 3.69 MHz
//CPU_3Mhz69
{BPS_600_3MHz69, BPS_1200_3MHz69, BPS_2400_3MHz69, BPS_4800_3MHz69,
BPS_9600_3MHz69, BPS_14400_3MHz69, BPS_19200_3MHz69, BPS_28800_3MHz69,
Rev. 1.50
Return Codes None.
Purpose
Synopsis
Parameters
Return Codes None.
Select the CPU speed. This API should be called after
change in CPU speed is desired. The default speed is 3.69 MHz. Care should be
taken when selecting speeds other than 3.69 MHz, as the speed will affect the
number of supported Serial baud rates and timers API. The timer and Serial baud
rates will be adjusted internally by the LAPI. A wait state will be inserted to allow
USB I/O access time, i.e. CKCON will be set to the appropriate value to adjust wait
states.
void CPU_Select ( enum CPU_SPEED speed )
speed: Input parameter
Specifies which CPU speed to run. Possible values are
Baud Rate (bps)
600
1200
2400
4800
9600
14400
19200
28800
38400
57600
115200
115385
187500
375000
750000
CPU_3Mhz69 0,
CPU_6Mhz
CPU_12Mhz
CPU_24Mhz
Table 4: Clock Speeds and Baud Rates Supported
1,
2,
3
MHz
3.69
X
X
X
X
X
X
X
X
X
X
X
X
CPU Clock Rate
6 MHz
X
X
X
X
X
MHz
12
X
X
X
X
X
X
Table 4
73S12xxF Software User Guide
24 MHz
API_Init()
X
X
X
X
X
X
lists the baud rates
is called if a
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