tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 344

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

22.6 Interface Specifications
22. Serial PROM Mode
RA002
22.6 Interface Specifications
22.6.1 SIO communication
22.6.2 UART communication
selected based on the first serial data value received after a reset.
controller, etc.) must be set as described below.
The serial PROM mode supports two communication methods: UART and SIO. The communication method is
To execute an on-board program, the communication format of the external controller (personal computer, micro-
must supply the TMP89FM42 with a serial clock (SCLK0 pin) for synchronization.
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.
tics (SIO) ".
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)".
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.
If the TMP89FM42 receives serial data "0x30" after a reset, it starts the SIO communication.
In the SIO communication, the TMP89FM42 functions as a slave device. Therefore, the external controller
If the TMP89FM42 is not outputting serial data, it controls the hardware flow by using the SO0 pin. If inter-
For information on the communication timings of each operation command, refer to " 1.11 AC Characteris-
If the TMP89FM42 receives serial data "0x86" after a reset, it starts the UART communication. It also mea-
Usable baud rates differ depending on the operating frequency and are shown in Table 22-4. However, there
- Transfer rate: 250 kbps (Max.)
- Data length: 8 bits
- Slave (external clock)
- Hardware flow control (SO0 pin)
- Baud rate: 9600 to 128000 bps (automatic detection)
- Data length: 8 bits (LSB first)
- Parity bit: None
- STOP bit: 1 bit
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TMP89FM42