C8051F045 View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

C8051F045

Mixed Signal ISP Flash MCU Family

Silicon Laboratories 

C8051F040/1/2/3/4/5/6/7

24.2. Capture/Compare Modules

Each module can be configured to operate independently in one of six operation modes: Edge-triggered

Capture, Software Timer, High Speed Output, Frequency Output, 8-Bit Pulse Width Modulator, or 16-Bit

Pulse Width Modulator. Each module has Special Function Registers (SFRs) associated with it in the CIP-

51 system controller. These registers are used to exchange data with a module and configure the module's

mode of operation.

Table 24.2 summarizes the bit settings in the PCA0CPMn registers used to select the PCA0 capture/com-

pare module’s operating modes. Setting the ECCFn bit in a PCA0CPMn register enables the module's

CCFn interrupt. Note: PCA0 interrupts must be globally enabled before individual CCFn interrupts are rec-

ognized. PCA0 interrupts are globally enabled by setting the EA bit (IE.7) and the EPCA0 bit (EIE1.3) to

logic 1. See Figure 24.3 for details on the PCA interrupt configuration.

Table 24.2. PCA0CPM Register Settings for PCA Capture/Compare Modules

PWM16 ECOM CAPP CAPN MAT

X

X

1

0

0

X

X

0

1

0

X

X

1

1

0

X

1

0

0

1

X

1

0

0

1

X

1

0

0

0

0

1

0

0

0

1

1

0

0

0

X = Don’t Care

TOG

0

0

0

0

1

1

0

0

PWM ECCF

Operation Mode

0

X

Capture triggered by positive edge on

CEXn

0

X

Capture triggered by negative edge on

CEXn

0

X Capture triggered by transition on CEXn

0

X

Software Timer

0

X

High-Speed Output

1

X

Frequency Output

1

0

8-Bit Pulse Width Modulator

1

0

16-Bit Pulse Width Modulator

(for n = 0 to 5)

PCA0CPMn

P ECCMT P E

WC A A AOWC

MOP P T GMC

1 MPN n n n F

6nnn

n

n

PCA Counter/

Timer Overflow

PCA0CN

CCCCCCCC

FRCCCCCC

FFFFFF

543210

PCA0MD

C

CCCE

I

PPPC

D

SSSF

L

210

0

1

PCA Module 0

CCF0

PCA Module 1

CCF1

PCA Module 2

CCF2

PCA Module 3

CCF3

PCA Module 4

CCF4

PCA Module 5

CCF5

ECCF0

0

1

ECCF1

0

1

ECCF2

0

1

ECCF3

0

1

ECCF4

0

1

ECCF5

0

1

EPCA0

(EIE1.3)

EA

(IE.7)

0

1

Figure 24.3. PCA Interrupt Block Diagram

0

Interrupt

Priority

1

Decoder

Rev. 1.5

305

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