TMP92FD54AI datasheet(38/84 Pages) TOSHIBA

38 / 84 page

2006-01-27

92FD54AI-38

TMP92FD54AI

1) RAM Transfer command (See Table 4.3.3.)

1. The data in the first byte is used to set the serial operation mode. For details

of how to set the serial operation mode, please refer to part 6), entitled

Determination of Serial Operation mode, on page 47 of subsection 4.3.2 (6),

Boot program. If the serial operation mode is found to be UART Mode, the

device checks to see if the baud rate can be set. So UART receiving function

needs to be disabled (SC1MOD0<RXE> = 0) in the first byte.

•

To communicate in UART Mode

Send the data value 86H from the controller to the target board in UART

mode at the desired baud rate. If the serial operation mode is found to be

UART Mode, the device checks to see whether the baud rate can be set. If

the device finds that the baud rate cannot be set, it stops operation, and

thus can no longer be communicated with.

2. The data in the second byte is the ACK response returned by the device for the

serial operation mode which is set by the data in the first byte. If the data in

the first byte is found to signify UART Mode and the baud rate can be set, the

device will return 86H.

•

UART Mode

The device checks to see if the baud rate can be set. If it is found that the

baud rate can be set, the device rewrites the BR1CR and BR1ADD

registers and returns 86H. If it is found that the baud rate cannot be set,

the device stops operation and hence does not send any information. The

controller sets a time-out time (5 seconds) after it has finished sending the

first byte of data. If the data (86H) cannot be received normally within the

time-out time, the device should be considered unable to communicate.

Reception is enabled (SC1MOD0 <RXE> = 1) before the data (86H) is

written to the transmission buffer.

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

case it is the data for the RAM Transfer command (10H).

4. 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 a Communications 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 10H

is echoed back and the program branches to the RAM transfer processing

routine. After branching to this routine, the device checks the data in the

password area. For details of how to check the data in the password area, refer

TMP92FD54AI 数据表(PDF) 38 Page - Toshiba Semiconductor

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