C8051F38C-GMR View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

MFG CO.

C8051F38C-GMR

Full Speed USB Flash MCU Family

Silicon Laboratories 

C8051F380/1/2/3/4/5/6/7/C

27.3. 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 sys-

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

of operation. Table 27.2 summarizes the bit settings in the PCA0CPMn register used to select the PCA

capture/compare module’s operating mode. Setting the ECCFn bit in a PCA0CPMn register enables the

module's CCFn interrupt.

Table 27.2. PCA0CPM Bit Settings for PCA Capture/Compare Modules

Operational Mode

Capture triggered by positive edge on CEXn

Capture triggered by negative edge on CEXn

Capture triggered by any transition on CEXn

Software Timer

High Speed Output

Frequency Output

8-Bit Pulse Width Modulator

16-Bit Pulse Width Modulator

PCA0CPMn

Bit Number 7 6 5 4 3 2 1 0

XX1 0 0 0 0A

XX0 1 0 0 0A

XX1 1 0 0 0A

XB0 0 1 0 0A

XB0 0 1 1 0A

XB0 0 0 1 1A

0B0 0C0 1A

1B0 0C0 1A

Notes:

1. X = Don’t Care (no functional difference for individual module if 1 or 0).

2. A = Enable interrupts for this module (PCA interrupt triggered on CCFn set to 1).

3. B = When set to 0, the digital comparator is off. For high speed and frequency output modes, the associated

pin will not toggle. In any of the PWM modes, this generates a 0% duty cycle (output = 0).

4. C = When set, a match event will cause the CCFn flag for the associated channel to be set.

Rev. 1.4

301

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