C8051F126 datasheet(4/16 Pages) SILABS

Part #	C8051F126

Description	The C8051F12x series is pin compatible

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Manufacturer	SILABS [Silicon Laboratories]

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AN131

4

Rev. 1.3

(0x0093). The interrupt vector changes are outlined

in the tables below.

Device Comparison and

Porting Checklist

When porting a project from a C8051F02x device

to a C8051F12x device, some code modifications

are required and others are made to fully utilize the

enhanced flexibility and performance of the

C8051F12x devices. Both types of modifications

are discussed below, sorted by peripheral.

Analog-to-Digital Converter

(ADC)

Both the 12-bit and 10-bit versions of ADC0 are

identical to ADC0 on the ‘F02x devices. ADC1 (8-

bit 500 ksps) has been renamed to ADC2 on the

‘F12x. ADC2 now supports differential mode in

addition to single-ended mode and has its own Pro-

grammable

Window

Comparator.

Also,

the

CNVSTR signal has been renamed to CNVSTR0.

Please refer to the C8051F12x datasheet for ADC2

configuration information. Note that SFRPAGE

should be set to ADC0_PAGE or ADC2_PAGE

when reading or writing the corresponding ADC

registers.

Digital-to-Analog Converter

(DAC)

Both DAC0 and DAC1 on the ‘F12x are identical

to DAC0 and DAC1 on the ‘F02x. However, be

sure to set the SFRPAGE to DAC0_PAGE or

DAC1_PAGE before reading or writing to any

DAC registers.

Voltage Reference (VREF)

VREF1 on the ‘F02x has been renamed to VREF2

on the ‘F12x. Pin locations are unchanged. Note

that SFRPAGE should be set to LEGACY_PAGE

before any reads or writes to REF0CN.

Comparators

The comparators on the ‘F12x have been enhanced

over the equivalent ‘F02x comparators with a new

speed/power selection capability. As a result, two

new registers, CPT0MD and CPT1MD, have been

added to accommodate this new feature. These reg-

isters

give

the

user

the

option

of

putting

comparator 0 and comparator 1 in a low power

mode. The reset value for these registers leaves the

speed and power consumption of ‘F12x compara-

Figure 2. Interrupts Added to the

‘F12x

Interrupt

Source

Interrupt

Vector

Priority

ADC2 Window

Comparator

0x008B

17

Figure 3. Interrupts No Longer

Present in the ‘F12x

Interrupt

Source

Interrupt

Vector

Priority

External

Interrupt 6

0x0093

18

External

Interrupt 7

0x009B

19

External

Crystal OSC

Ready

0x00AB

21

Figure 4. Interrupts That Have

Changed Locations in the ‘F12x

Interrupt

Source

Interrupt

Vector

Priority

ADC1 End of

Conversion

is now

ADC2 End of

Conversion

0x008B

0x0093

17

18

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