DSPIC33FJ06GS201TESLASHMM datasheet(24/346 Pages) MICROCHIP

24 / 346 page

dsPIC33FJ06GS101/X02 and dsPIC33FJ16GSX02/X04

DS70318D-page 22

Preliminary

2.7

Oscillator Value Conditions on

Device Start-up

If the PLL of the target device is enabled and

configured for the device start-up oscillator, the

maximum oscillator source frequency must be limited

to 4 MHz < FIN < 8 MHz to comply with device PLL

start-up conditions. This means that if the external

oscillator frequency is outside this range, the

application must start up in the FRC mode first. The

default PLL settings after a POR with an oscillator

frequency outside this range will violate the device

operating speed.

Once the device powers up, the application firmware

can initialize the PLL SFRs, CLKDIV, and PLLDBF to a

suitable value, and then perform a clock switch to the

Oscillator + PLL clock source. Note that clock switching

must be enabled in the device Configuration word.

2.8

Configuration of Analog and

Digital Pins During ICSP

Operations

If MPLAB ICD 2, ICD 3 or REAL ICE is selected as a

debugger, it automatically initializes all of the A/D input

pins (ANx) as “digital” pins, by setting all bits in the

ADPCFG register.

The bits in the registers that correspond to the A/D pins

that are initialized by MPLAB ICD 2, ICD 3, or REAL

ICE, must not be cleared by the user application firm-

ware; otherwise, communication errors will result

between the debugger and the device.

If your application needs to use certain A/D pins as

analog input pins during the debug session, the user

application must clear the corresponding bits in the

ADPCFG register during initialization of the ADC mod-

ule.

When MPLAB ICD 2, ICD 3, or REAL ICE is used as a

programmer, the user application firmware must

correctly configure the ADPCFG register. Automatic

initialization of these registers is only done during

debugger operation. Failure to correctly configure the

analog input pins, resulting in the port value being read

as a logic '0', which may affect user application func-

tionality.

2.9

Unused I/Os

Unused I/O pins should be configured as outputs and

driven to a logic-low state.

Alternatively, connect a 1k to 10k resistor to VSS on

unused pins and drive the output to logic low.

2.10

Typical Application Connection

Examples

Examples of typical application connections are shown

in Figure 2-4 through Figure 2-11.

DSPIC33FJ06GS201TE/MM Datasheet(PDF) 24 Page - Microchip Technology

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