tmp88fw45afg TOSHIBA Semiconductor CORPORATION, tmp88fw45afg Datasheet - Page 250

• Manufacturer Part Number: tmp88fw45afg
• Description: 8 Bit Microcontroller Tlcs-870/x Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

21.3
Serial PROM Mode Setting
21.3
21.3.1
21.3.2
Table 21-3 Pin Function in the Serial PROM Mode
TXD1
BOOT/RXD1
RESET
TEST
VDD, AVDD
VSS, AVSS
VAREF
P10, P11
I/O ports except
P45, P44
XIN
XOUT
(Serial PROM Mode)
Note:The BOOT pin is shared with the UART communication pin (RXD1 pin) in the serial PROM mode. This pin is
Note 1: During on-board programming with other parts mounted on a user board, be careful no to affect these communication
Note 2: Operating range of high frequency in serial PROM mode is 8 MHz to 20 MHz.
Note 3: TXD port is set a open-drain port in seriarl PROM mode and it needs pull-up resistor.
Serial PROM Mode Setting
the serial PROM mode.
Pin Name
To execute on-board programming, activate the serial PROM mode. Table 21-2 shows pin setting to activate
In the serial PROM mode, TXD1 (P45) and RXD1 (P44) are used as a serial interface pin.
used as UART communication pin after activating serial PROM mode
Serial PROM Mode Control Pins
Pin Function
control pins.
Output
Input/Input
Input
Input
Power
supply
Power
supply
Power
supply
Input
I/O
Input
Output
Output
Input/
Table 21-2 Serial PROM Mode Setting
BOOT/RXD1 pin
Serial data output (Note 3)
Serial PROM mode control/Serial data input
Serial PROM mode control
Fixed to high
4.5 to 5.5 V
0 V
Leave open or apply input reference voltage.
Fixed to low
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.) To
make the port inputs valid, set the pin of the SPCR register to “1” by the RAM loader control program.
Self-oscillate with an oscillator.
RESET pin
P10, P11
TEST pin
Pin
Page 236
Function
Setting
High
High
Low
(Note 1)
P45
P44
RESET
TEST
TMP88FW45AFG
(MCU Mode)
Pin Name
(Note 2)