tmp88f846ug TOSHIBA Semiconductor CORPORATION, tmp88f846ug Datasheet - Page 226

• Manufacturer Part Number: tmp88f846ug
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

19.14 Port Input Control Register
19. Serial PROM Mode
19.14Port Input Control Register
Port Input Control Register
(01FFEH)
SPCR
to prevent overlap current to unused ports. (All port inputs and peripheral function inputs shared with the ports
become invalid.) Therefore, to access to the flash memory in the RAM loader mode without UART communication,
port inputs must be valid. To make port inputs valid, set the pin of the port input control register (SPCR) to “1”.
In the serial PROM mode, the input level is fixed to the all ports except P45 and P44 ports with a hardware feature
The SPCR register is not operated in the MCU mode.
Note 1: The SPCR register can be read or written only in the serial PROM mode. When the write instruction is executed to the
Note 2: All I/O ports except P45 and P44 ports are controlled by the SPCR register.
SPCR register in the MCU mode, the port input control can not be performed. When the read instruction is executed for
the SPCR register in the MCU mode, read data of bit7 to 1 are unstable.
PIN
7
Port input control in the serial PROM
mode
6
5
4
Page 216
3
0 : Invalid port inputs (The input level is fixed with a hardware feature.)
1 : Valid port inputs
2
1
PIN
0
(Initial value: **** ***0)
TMP88F846UG
R/W