Maxim-integrated 73S12xxF Software Bedienungsanleitung PDF herunterladen (Seite 51)

UG_12xxF_016 73S12xxF Software User Guide

Rev. 1.50 51

Return Codes None.

4.2.8 Clock Generator Circuit API – Available with all 73S12xxF Devices

The Clock Generator API configures the system clock speed.

CPU_Select()

Purpose Select the CPU speed. This API should be called after API_Init() is called if a

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.

Synopsis void CPU_Select ( enum CPU_SPEED speed )

Parameters speed: Input parameter

Specifies which CPU speed to run. Possible values are

CPU_3Mhz69 0,

CPU_6Mhz 1,

CPU_12Mhz 2,

CPU_24Mhz 3

Return Codes None.

Some CPU speeds will limit the number of Serial baud rates supported. Table 4 lists the baud rates

supported by specific CPU clock rates.

Table 4: Clock Speeds and Baud Rates Supported

Baud Rate (bps)

CPU Clock Rate

3.69

MHz

6 MHz 12

MHz

24 MHz

600

1200 X X

2400 X X X

4800 X X X

9600 X X X

14400

19200 X X

28800 X X X

38400 X

57600 X X

115200

115385 X

187500 X

375000 X

750000 X

//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,

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 92 93

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