86FS27-12

2007-08-07

TMP86FS27

2.6

Operation Mode

There are four operating modes in serial PROM mode: Flash memory writing mode, RAM loader

mode, flash memory SUM output mode and product discrimination code output mode. For details

about these modes, refer to (1) Flash memory writing mode through (4) Product discrimination code

output mode.

(1) Flash memory writing mode

The data are written to the specified flash memory addresses. The controller should send the

write data in the Intel Hex format (Binary). For details of writing data format, refer to 2.7

“Flash Memory Writing Data Format”.

If no errors are encountered till the end record, the SUM of 60 Kbytes of flash memory is

calculated and the result is returned to the controller.

To execute the flash memory writing mode, the TMP86FS27 checks the passwords except a

blank product. If the passwords did not match, the program is not executed.

(2) RAM loader mode

The RAM loader transfers the data into the internal RAM that has been sent from the

controller in Intel Hex format. When the transfer has terminated normally, the RAM loader

calculates the SUM and sends the result to the controller before it starts executing the user

program. After sending of SUM, the program jumps to the start address of RAM in which the

first transferred data has been written. This RAM loader function provides the user's own way

to control on-board programming.

To execute the RAM loader mode, the TMP86FS27 checks the passwords except a blank

product. If the passwords did not match, the program is not executed.

(3) Flash memory SUM output mode

The SUM of 60 Kbytes of flash memory is calculated and the result is returned to the

controller.

The BOOT ROM does not support the reading function of the flash memory. Instead, it has

this SUM command to use. By reading the SUM, it is possible to manage Revisions of

application programs.

(4) Product discrimination code output mode

The product discrimination code is output as a 13-byte data, that includes the start address

and the end address of ROM. (In case of TMP86FS27, the start address is 1000H and the end

address is FFFFH.) Therefore, the controller can recognize the device information by using this

function.