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TMP86FS27

CMOS 8-Bit Microcontroller

Toshiba 

TMP86FS27

2.3 Serial PROM Mode Setting

2.3.1

Serial PROM Mode Control Pins

To execute on-board programming, start the TMP86FS27 in serial PROM mode. Setting of a

serial PROM mode is shown in Table 2.3.1.

Table 2.3.1 Serial PROM Mode Setting

Pin

TEST pin

BOOT1 (RXD) (Note)

BOOT2 (TXD) (Note)

RESET pin

Setting

High

High

High

Note: BOOT1 is RXD pin and BOOT2 is TXD pin during a serial PROM mode.

2.3.2

Pin Function

In the serial PROM mode, TXD (P01) and RXD (P00) pins are used as a serial interface pin.

Therefore, if the programming is executed on-board after mounting, these pins should be released

from the other devices for communication in serial PROM mode.

Pin Name

(Serial PROM mode)

BOOT1/RXD

BOOT2/TXD

TEST

RESET

VDD, AVDD

VSS

VAREF

P07 to P02, P17 to P10, P22 to P20,

P37 to P30, P43 to P40, P57 to P50,

P67 to P60, P77 to P70

SEG7 to SEG0

COM3 to COM0

C0, C1, V1, V2, V3

XIN

XOUT

Input/

Output

Input/Input

Input/Output

Input

I/O

Power supply

I/O

Output

Output

LCD power

supply

Input

Output

Functions

Pin Name

(MCU mode)

Fix “High” during reset. This pin is used as

RXD pin after releasing reset.

P00

Fix “High” during reset. This pin is used as

TXD pin after releasing reset.

P01

Fix to “High”.

Reset signal input or an internal error reset output.

5V

0V

Leave open or apply reference voltage.

Open

0 V output (Open)

0 V output (Open)

Not use

Self oscillation with resonator (2 MHz, 4 MHz, 8 MHz, 16 MHz)

Note: When the device is used as on-board writing and other parts are already mounted in place, be

careful not to affect these communication control pins.

86FS27-9

2007-08-07

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