MC68HC711A8CP1 View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

MC68HC711A8CP1

ROM-based high-performance microcontrollers

Freescale Semiconductor 

Freescale Semiconductor, Inc.

EXTAL

XTAL

OSCILLATOR

AND

CLOCK GENERATOR

(÷ 4)

E

AS

INTERNAL BUS CLOCK (PH2)

÷3

÷4

÷ 13

SCP[1:0]

0:0

0:1

1:0

1:1

SCR[2:0]

0:0:0

÷2

0:0:1

÷2

0:1:0

÷2

0:1:1

÷2

1:0:0

÷2

1:0:1

÷2

1:1:0

÷ 16

SCI

TRANSMIT

BAUD RATE

(1X)

÷2

1:1:1

SCI

RECEIVE

BAUD RATE

(16X)

SCI BAUD GENERATOR

Figure 7-3 SCI Baud Rate Diagram

7.7 Status Flags and Interrupts

The SCI transmitter has two status flags. These status flags can be read by software

(polled) to tell when the corresponding condition exists. Alternatively, a local interrupt

enable bit can be set to enable each of these status conditions to generate interrupt

requests when the corresponding condition is present. Status flags are automatically

set by hardware logic conditions, but must be cleared by software, which provides an

interlock mechanism that enables logic to know when software has noticed the status

indication. The software clearing sequence for these flags is automatic — functions

that are normally performed in response to the status flags also satisfy the conditions

of the clearing sequence.

7-10

SERIAL COMMUNICATIONS INTERFACE

For More Information On This Product,

Go to: www.freescale.com

TECHNICAL DATA

Share Link: