tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 340

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

22.3 Serial PROM Mode Setting
22. Serial PROM Mode
RA002
22.3 Serial PROM Mode Setting
Table 22-3 Pin Functions in Serial PROM Mode
22.3.1 Serial PROM mode control pins
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 (H) level by
Note 1: If other parts are mounted on a user board, they may interfere with data being communicated through these communica-
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
using a pull-up resistor.
tion pins during on-board programming. It is recommended that these parts be somehow isolated to prevent the pins from
being affected.
Input/out-
Input/out-
Output
supply
supply
supply
Output
Power
Power
Power
Input
Input
Input
Input
Input
put
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 physically 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.
4.5 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,
Pin
RESET
pin
Page 326
Function
Setting
H level
H level
(See note 1)
TXD0 / SO0 / P20
RXD0 / SI0 / P21
RESET
MODE
SCLK0
Pin name (in MCU mode)
TMP89FM42