86FS27-9

2007-08-07

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

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.

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.

Pin Name

(Serial PROM mode)

Input/

Output

Functions

Pin Name

(MCU mode)

BOOT1/RXD

Input/Input

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

RXD pin after releasing reset.

P00

BOOT2/TXD

Input/Output

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

TXD pin after releasing reset.

P01

TEST

Input

Fix to “High”.

RESET

I/O

Reset signal input or an internal error reset output.

VDD, AVDD

Power supply

5 V

VSS

0 V

VAREF

Leave open or apply reference voltage.

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

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

P67 to P60, P77 to P70

I/O

Open

SEG7 to SEG0

Output

0 V output (Open)

COM3 to COM0

Output

0 V output (Open)

C0, C1, V1, V2, V3

LCD power

supply

Not use

XIN

Input

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

XOUT

Output

Pin

Setting

TEST pin

High

BOOT1 (RXD)

(Note)

High

BOOT2 (TXD)

(Note)

High

RESET

pin