TMP89FS60 datasheet(346/410 Pages) TOSHIBA

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22. Serial PROM Mode

22.6 Interface Specifications

TMP89FS60

RA002

22.6 Interface Specifications

The serial PROM mode supports two communication methods: UART and SIO. The communication method is

selected based on the first serial data value received after a reset.

To execute an on-board program, the communication format of the external controller (personal computer, micro-

controller, etc.) must be set as described below.

22.6.1 SIO communication

- Transfer rate: 250 kbps (Max.)

- Data length: 8 bits

- Slave (external clock)

- Hardware flow control (SO0 pin)

If the TMP89FS60 receives serial data "0x30" after a reset, it starts the SIO communication.

In the SIO communication, the TMP89FS60 functions as a slave device. Therefore, the external controller

must supply the TMP89FS60 with a serial clock (SCLK0 pin) for synchronization.

If the TMP89FS60 is not outputting serial data, it controls the hardware flow by using the SO0 pin. If inter-

nal data processing is not completed yet, though data has been received, the SO0 pin outputs the L level. If

internal data processing has progressed to a near-completion state or if it has been completed, the SO0 pin out-

puts the H level. The external controller must check the status of the SO0 pin before it starts to supply a serial

clock.

For information on the communication timings of each operation command, refer to " 1.11 AC Characteris-

tics (SIO) ".

22.6.2 UART communication

- Baud rate: 9600 to 128000 bps (automatic detection)

- Data length: 8 bits (LSB first)

- Parity bit: None

- STOP bit: 1 bit

If the TMP89FS60 receives serial data "0x86" after a reset, it starts the UART communication. It also mea-

sures the pulse width of the received data (0x86), and automatically establishes the reference baud rate. In all

subsequent data communication transactions, this reference baud rate is used. For information on the commu-

nication timings of each operation command, refer to "22.14 AC Characteristics (UART)".

Usable baud rates differ depending on the operating frequency and are shown in Table 22-4. However, there

is the possibility of data communication not working properly, even if a baud rate shown in Table 22-4 is used,

because data communication is affected by frequency errors of a resonator of the external controller (personal

computer, etc.), the load capacity of a communication pin, and various other factors.

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