TMP92FD54AI datasheet(42/84 Pages) TOSHIBA

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2006-01-27

92FD54AI-42

TMP92FD54AI

2) Flash Memory SUM command (See Table 4.3.4.)

1. The transmitted/received data in the first and second bytes are the same as

for the RAM Transfer command.

2. The data received in the third byte is the operation command data. In this

case it is flash memory SUM command data (20H).

3. The data in the fourth byte is the ACK response data returned by the device

for the operation command data in the third byte. The first, the device checks

if the received data in the third byte contains an error. If a Receive error is

found, the device returns the ACK response data for, Communication error

(bit 3) X8H and waits for the next operation command (third byte). The four

high-order bits of the returned ACK response data are undefined. (They are

the four high-order bits of the immediately preceding operation command

data.)

Next, if the data received in the third byte corresponds to one of the operation

command values given in Table 4.3.2, the device echoes back the received data

(the ACK response data for normal reception). In this case the data value 20H

is echoed back and the program branches to the flash memory SUM

processing routine. If the received data does not correspond to any operation

command the device returns the ACK response data for an Operation

Command error (bit 0) X1H and waits for the next operation command (third

byte). The four high-order bits of the returned ACK response data are

undefined. (They are the four high-order bits of the immediately preceding

operation command data.)

4. The data in the fifth and the sixth bytes sent by the device are the high-order

and the low-order SUM data respectively. For details of how to calculate SUM,

please refer to part 8), entitled

Calculating SUM, on page 51 of subsection

4.2.2 (6),

Boot program.

5. The data in the seventh byte sent by the device is CHECKSUM data. This is

the low-order 8-bit value in 2’s complement representation obtained by adding

eight bits of transmit data in the fifth to the sixth bytes not including the sign

(ignoring overflow).

6. The data received as the eighth byte is the data value for the next operation

command.

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