C8051F020-TB Silicon Laboratories Inc, C8051F020-TB Datasheet - Page 249

• Manufacturer Part Number: C8051F020-TB
• Description: BOARD PROTOTYPING W/C8051F020
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F020-TB

• Contents: Board
• Processor To Be Evaluated: C8051F02x
• Interface Type: USB
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: C8051F020
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

23.
The Programmable Counter Array (PCA0) provides enhanced timer functionality while requiring less CPU interven-
tion than the standard 8051 counter/timers. PCA0 consists of a dedicated 16-bit counter/timer and five 16-bit capture/
compare modules. Each capture/compare module has its own associated I/O line (CEXn) which is routed through the
Crossbar to Port I/O when enabled (See
page
system clock, system clock divided by four, system clock divided by twelve, the external oscillator clock source
divided by 8, Timer 0 overflow, or an external clock signal on the ECI line. Each capture/compare module may be
configured to operate independently in one of six modes: Edge-Triggered Capture, Software Timer, High-Speed Out-
put, Frequency Output, 8-Bit PWM, or 16-Bit PWM (each is described in
controlled through the system controller's Special Function Registers. The basic PCA block diagram is shown in
Figure 23.1.
163). The counter/timer is driven by a programmable timebase that can select between six inputs as its source:
PROGRAMMABLE COUNTER ARRAY
Capture/Compare
Module 0
SYSCLK/12
Timer 0 Overflow
SYSCLK
External Clock/8
SYSCLK/4
ECI
Capture/Compare
Figure 23.1. PCA Block Diagram
Module 1
CLOCK
Section “17.1. Ports 0 through 3 and the Priority Crossbar Decoder” on
MUX
PCA
Crossbar
16-Bit Counter/Timer
Port I/O
Capture/Compare
Rev. 1.4
Module 2
Section
Capture/Compare
Module 3
C8051F020/1/2/3
23.2). The PCA is configured and
Capture/Compare
Module 4
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