TMP86FS28DFG datasheet(232/272 Pages) TOSHIBA

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Page 220

18. Serial PROM Mode

18.3 Serial PROM Mode Setting

TMP86FS28DFG

18.3 Serial PROM Mode Setting

18.3.1 Serial PROM Mode Control Pins

To execute on-board programming, activate the serial PROM mode. Table 18-2 shows pin setting to activate

the serial PROM mode.

Note: The BOOT pin is shared with the UART communication pin (RXD1 pin) in the serial PROM mode. This pin is used as UART

communication pin after activating serial PROM mode

18.3.2 Pin Function

In the serial PROM mode, TXD1 (P35) and RXD1 (P34) are used as a serial interface pin.

Note 1: During on-board programming with other parts mounted on a user board, be careful no to affect these communication

control pins.

Note 2: Operating range of high frequency in serial PROM mode is 2 MHz to 16 MHz.

Table 18-2 Serial PROM Mode Setting

Setting

TEST pin

High

BOOT/RXD1 pin

High

RESET

Table 18-3 Pin Function in the Serial PROM Mode

Pin Name

(Serial PROM Mode)

Input/

Output

Function

Pin Name

(MCU Mode)

TXD1

Output

Serial data output

(Note 1)

P35

BOOT/RXD1

Input/Input

Serial PROM mode control/Serial data input

P34

RESET

Input

Serial PROM mode control

RESET

TEST

Input

Fixed to high

TEST

VDD, AVDD

Power

supply

4.5 to 5.5 V

VSS, AVSS

Power

supply

0 V

VAREF

Power

supply

Leave open or apply input reference voltage.

I/O ports except

P35, P34

I/O

These ports are in the high-impedance state in the serial PROM mode. The input level is fixed to

the port inputs with a hardware feature to prevent overlap current. (The port inputs are invalid.)

COM3 to COM0

Output

Low output in the serial PROM mode

C0,C1,V3 to V1

Connect to a capacitor (resistance), or leave open.

XIN

Input

Self-oscillate with an oscillator.

(Note 2)

XOUT

Output

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