TMP86FS49BFG Datasheet, PDF (250/294 Pages) Toshiba Semiconductor – 8 Bit Microcontroller

20. Serial PROM Mode
20.3 Serial PROM Mode Setting
TMP86FS49BFG
20.3 Serial PROM Mode Setting
20.3.1 Serial PROM Mode Control Pins
To execute on-board programming, activate the serial PROM mode. Table 20-2 shows pin setting to activate
the serial PROM mode.
Table 20-2 Serial PROM Mode Setting
Pin
TEST pin
BOOT/RXD1 pin
Setting
High
High
RESET pin
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
20.3.2 Pin Function
In the serial PROM mode, TXD1 (P02) and RXD1 (P01) are used as a serial interface pin.
Table 20-3 Pin Function in the Serial PROM Mode
Pin Name
(Serial PROM Mode)
TXD1
BOOT/RXD1
RESET
TEST
VDD, AVDD
VSS
VAREF
I/O ports except
P02, P01
XIN
XOUT
Input/
Output
Function
Pin Name
(MCU Mode)
Output
Serial data output
P02
Input/Input Serial PROM mode control/Serial data input
(Note 1) P01
Input
Serial PROM mode control
RESET
Input
Fixed to high
TEST
Power
supply
4.5 to 5.5 V
Power
0V
supply
Power
supply
Leave open or apply input reference voltage.
I/O
These ports are in the high-impedance state in the serial PROM mode.
Input
Output
Self-oscillate with an oscillator.
(Note 2)
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.
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