86F808-10

2007-08-07

TMP86F808

To set a serial PROM mode, connect device pins as shown in Figure 2.3.1.

Figure 2.3.1 Serial PROM Mode Port Setting

2.3.3

Activating Serial PROM Mode

The following is a procedure of setting of serial PROM mode. Figure 2.3.2 shows a serial PROM

mode timing.

(1) Turn on the power to the VDD pin.

(3) Set the TEST, BOOT1 and BOOT2 pin to high level.

(4) Wait until the power supply and clock sufficiently stabilize.

(6) Input a matching data (5AH) to BOOT1/RXD pin after waiting for setup sequence. For details

of the setup timing, refer to 2.14 “UART Timing”.

Figure 2.3.2 Serial PROM Mode Timing

TMP86F808

VDD(4.5 V to 5.5 V)

VDD

TEST

RXD (P10)

TXD (P11)

RESET

: Pull up

XIN

XOUT

BOOT1/RXD

BOOT2/TXD

VSS

VDD

TEST (Input)

RESET

(Input)

Program

BOOT1 (Input)/

RXD (Input)

BOOT2 (Input)/

TXD (Output)

Serial PROM mode

Reset mode

Indeterminate

Matching

data input

Setup time for serial PROM mode (Rxsup)

Fixed to high level by pull up