C8051T603-GS(2007) View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

MFG CO.

C8051T603-GS
(Rev.:2007)

Mixed Signal OTP EPROM MCU Family

Silicon Laboratories 

C8051T600/1/2/3/4/5

1.4. Programmable Digital I/O and Crossbar

C8051T600/1/2/3/4/5 devices include a byte-wide I/O Port that behaves like a typical 8051 Port with a few

enhancements. Each Port pin may be configured as an analog input or a digital I/O pin. Pins selected as

digital I/Os may additionally be configured for push-pull or open-drain output. The “weak pullups” that are

fixed on typical 8051 devices may be globally disabled, providing additional power savings.

Perhaps the most unique Port I/O enhancement is the Digital Crossbar. This is a digital switching network

that allows mapping of internal digital system resources to Port I/O pins (See Figure 1.5). On-chip counter/

timers, serial buses, HW interrupts, comparator output, and other digital signals in the controller can be

configured to appear on the Port I/O pins using the Crossbar Control registers. This allows the user to

select the exact mix of general purpose Port I/O and digital resources needed for the application.

XBR0, XBR1,

XBR2 Registers

P0MDOUT,

P0MDIN Registers

Highest

Priority

Lowest

Priority

2

UART

Priority

Decoder

2

SMBus

CP0

2

Outputs

SYSCLK

Digital

Crossbar

8

PCA

4

2

T0, T1

8

Port Latch P0 (P0.0-P0.7)

P0

I/O

Cells

P0.0

P0.7

Figure 1.5. Digital Crossbar Diagram

1.5. Serial Ports

The C8051T600/1/2/3/4/5 Family includes an SMBus/I2C interface and a full-duplex UART with enhanced

baud rate configuration. Each of the serial buses is fully implemented in hardware and makes extensive

use of the CIP-51's interrupts, thus requiring very little CPU intervention. Both serial buses can be used at

the same time.

1.6. Programmable Counter Array

An on-chip Programmable Counter/Timer Array (PCA) is included in addition to the three 16-bit general

purpose counter/timers. The PCA consists of a dedicated 16-bit counter/timer time base with three pro-

grammable capture/compare modules. The PCA clock is derived from one of six sources: the system clock

divided by 12, the system clock divided by 4, Timer 0 overflows, an External Clock Input (ECI), the system

clock, or the external oscillator clock source divided by 8. The external clock source selection is useful for

Rev. 0.5

19

Share Link: