tmp89fm42a TOSHIBA Semiconductor CORPORATION, tmp89fm42a Datasheet - Page 363

• Manufacturer Part Number: tmp89fm42a
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

22.3
Serial PROM Mode Setting
RA003
22.3
Table 22-3 Pin Functions in Serial PROM Mode
22.3.1
TXD0 / SO0
RXD0 / SI0
RESET
MODE
SCLK0
VDD
VAREF / AVDD
VSS
Input/output port other than
RXD0 and TXD0
XIN
XOUT
(in serial PROM mode)
Note:Before you activate the serial PROM mode, you must set the RXD0/SI0/P21 and TXD0/SO0/P20 pins to high
Note 1: If other parts are mounted on a user board, they may interfere with data being communicated through these communication
Serial PROM Mode Setting
activate the serial PROM mode.
Pin name
To execute on-board programming, activate the serial PROM mode. Table 22-2 shows the pin setting used to
(H) level by using a pull-up resistor.
Serial PROM mode control pins
pins during on-board programming. It is recommended that these parts be somehow isolated to prevent the pins from
being affected.
Input/out-
Output
supply
supply
supply
Output
Power
Power
Power
output
Input/
Input
Input
Input
Input
Input
put
Table 22-2 Serial PROM Mode Setting
TXD0 / SO0 / P20 pin
RXD0 / SI0 / P21 pin
Serial PROM mode control/serial data output
Serial PROM mode control/serial data input
Serial PROM mode control
Serial PROM mode control
Serial clock input (if SIO is used)
These ports are in the high-impedance state in the serial
PROM mode. If the UART is used, the port input is phys-
ically fixed to a specified input level in order to prevent a
penetration current. To enable the port input, the
SPCR<PIN1> must be set to "1" by operating the RAM
loader control program.
4.3 V to 5.5 V
Connect to VDD.
0 V
These ports are in the high-impedance state in the serial PROM mode. The port input is physically
fixed to a specified input level in order to prevent a penetration current (the port input is disabled). To
enable the port input, the SPCR<PIN0> must be set to "1" by operating the RAM loader control pro-
gram.
Connect a resonator to make these pins self-oscillate.
MODE, RESET pin
Pin
Page 344
Function
Setting
H level
H level
(See note 1)
TXD0 / SO0 / P20
RXD0 / SI0 / P21
RESET
MODE
SCLK0
Pin name (in MCU mode)
TMP89FM42A