C8051F011 View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

C8051F011

Mixed-Signal 32KB ISP FLASH MCU Family

Unspecified 

C8051F000/1/2/5/6/7

C8051F010/1/2/5/6/7

PRELIMINARY

1.1.3. Additional Features

The C8051F000 MCU family has several key enhancements both inside and outside the CIP-51 core to improve its

overall performance and ease of use in the end applications.

The extended interrupt handler provides 21 interrupt sources into the CIP-51 (as opposed to 7 for the standard 8051),

allowing the numerous analog and digital peripherals to interrupt the controller. An interrupt driven system requires

less intervention by the MCU, giving it more effective throughput. The extra interrupt sources are very useful when

building multi-tasking, real-time systems.

There are up to seven reset sources for the MCU: an on-board VDD monitor, a Watchdog Timer, a missing clock

detector, a voltage level detection from Comparator 0, a forced software reset, the CNVSTR pin, and the /RST pin.

The /RST pin is bi-directional, accommodating an external reset, or allowing the internally generated POR to be

output on the /RST pin. Each reset source except for the VDD monitor and Reset Input Pin may be disabled by the

user in software. The WDT may be permanently enabled in software after a power-on reset during MCU

initialization.

The MCU has an internal, stand alone clock generator which is used by default as the system clock after any reset. If

desired, the clock source may be switched on the fly to the external oscillator, which can use a crystal, ceramic

resonator, capacitor, RC, or external clock source to generate the system clock. This can be extremely useful in low

power applications, allowing the MCU to run from a slow (power saving) external crystal source, while periodically

switching to the fast (up to 16MHz) internal oscillator as needed.

Figure 1.5. On-Board Clock and Reset

VDD

(Port

I/O)

CP0+

CP0-

XTAL1

XTAL2

Crossbar

CNVSTR

(CNVSTR

reset

enable)

Comparator 0

+

-

(CP0

reset

enable)

Supply

Monitor

+

-

Supply

Reset

Timeout

Internal

Clock

Generator

OSC

Missing

Clock

Detector

(one-

shot)

EN

WDT

EN PRE

System

Clock

Clock Select

CIP-51

Software Reset

Microcontroller

Core

System Reset

Extended Interrupt

Handler

(wired-OR)

Reset

Funnel

/RST

4.2001; Rev. 1.3

CYGNAL Integrated Products, Inc.  2001

Page 13

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