P89C668 datasheet(65/89 Pages) PHILIPS

65 / 89 page

Philips Semiconductors

Product data

P89C660/P89C662/P89C664/

P89C668

80C51 8-bit Flash microcontroller family

16KB/32KB/64KB ISP/IAP Flash with 512B/1KB/2KB/8KB RAM

2002 Oct 28

+ 5V (+12V Tolerant)

+5V

TxD

RxD

VSS

VPP

VCC

TxD

RxD

RST

XTAL2

XTAL1

SU01265

VSS

VCC

89C660

89C662

89C664

89C668

“1”

P2.6, P2.7

Figure 56. In-System Programming with a Minimum of Pins

In-System Programming (ISP)

The In-System Programming (ISP) is performed without removing

the microcontroller from the system. The In-System Programming

(ISP) facility consists of a series of internal hardware resources

coupled with internal firmware to facilitate remote programming of

the P89C660/662/664/668 through the serial port. This firmware is

provided by Philips and embedded within each

P89C660/662/664/668 device.

The Philips In-System Programming (ISP) facility has made in-circuit

programming in an embedded application possible with a minimum

of additional expense in components and circuit board area.

The ISP function uses five pins: TxD, RxD, VSS, VCC, and VPP (see

Figure 56). Only a small connector needs to be available to interface

your application to an external circuit in order to use this feature.

The VPP supply should be adequately decoupled and VPP not

allowed to exceed datasheet limits.

Free ISP software is available on the Philips web site: “WinISP”

1. Direct your browser to the following page:

http://www.semiconductors.philips.com/products/standard/

microcontrollers/download/80c51/flash/

2. Download “WinISP.exe”

3. Execute WinISP.exe to install the software

Free ISP software is also available from the Embedded Systems

Academy: “FlashMagic”

1. Direct your browser to the following page:

http://www.esacademy.com/software/flashmagic/

2. Download Flashmagic

3. Execute “flashmagic.exe” to install the software

Using the In-System Programming (ISP)

The ISP feature allows for a wide range of baud rates to be used in

your application, independent of the oscillator frequency. It is also

adaptable to a wide range of oscillator frequencies. This is

accomplished by measuring the bit-time of a single bit in a received

character. This information is then used to program the baud rate in

terms of timer counts based on the oscillator frequency. The ISP

feature requires that an initial character (an uppercase U) be sent to

the P89C660/662/664/668 to establish the baud rate. The ISP

firmware provides auto-echo of received characters.

Once baud rate initialization has been performed, the ISP firmware

will only accept Intel Hex-type records. Intel Hex records consist of

ASCII characters used to represent hexadecimal values and are

summarized below:

:NNAAAARRDD..DDCC<crlf>

In the Intel Hex record, the “NN” represents the number of data

bytes in the record. The P89C660/662/664/668 will accept up to 16

(10H) data bytes. The “AAAA” string represents the address of the

first byte in the record. If there are zero bytes in the record, this field

is often set to 0000. The “RR” string indicates the record type. A

record type of “00” is a data record. A record type of “01” indicates

the end-of-file mark. In this application, additional record types will

be added to indicate either commands or data for the ISP facility.

The maximum number of data bytes in a record is limited to 16

(decimal). ISP commands are summarized in Table 14.

As a record is received by the P89C660/662/664/668, the

information in the record is stored internally and a checksum

calculation is performed. The operation indicated by the record type

is not performed until the entire record has been received. Should

an error occur in the checksum, the P89C660/662/664/668 will send

an “X” out the serial port indicating a checksum error. If the

checksum calculation is found to match the checksum in the record,

then the command will be executed. In most cases, successful

reception of the record will be indicated by transmitting a “.”

character out the serial port (displaying the contents of the internal

program memory is an exceptions).

In the case of a Data Record (record type 00), an additional check is

made. A “.” character will NOT be sent unless the record checksum

matched the calculated checksum and all of the bytes in the record

were successfully programmed. For a data record, an “X” indicates

that the checksum failed to match, and an “R” indicates that one of

the bytes did not properly program. It is necessary to send a type 02

record (specify oscillator frequency) to the P89C660/662/664/668

before programming data.

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