tmp89fm46a TOSHIBA Semiconductor CORPORATION, tmp89fm46a Datasheet - Page 365

• Manufacturer Part Number: tmp89fm46a
• Description: Tlcs-870/c1 Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

22.6
Interface Specifications
RA003
22.6
22.6.1
22.6.2
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-
Interface Specifications
must supply the TMP89FM46A with a serial clock (SCLK0 pin) for synchronization.
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 outputs the H
level. The external controller must check the status of the SO0 pin before it starts to supply a serial clock.
measures 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 com-
munication 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 TMP89FM46A receives serial data "0x30" after a reset, it starts the SIO communication.
In the SIO communication, the TMP89FM46A functions as a slave device. Therefore, the external controller
If the TMP89FM46A is not outputting serial data, it controls the hardware flow by using the SO0 pin. If internal
If the TMP89FM46A receives serial data "0x86" after a reset, it starts the UART communication. It also
Usable baud rates differ depending on the operating frequency and are shown in Table 22-4. However, there
SIO communication
UART communication
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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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TMP89FM46A