tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 58
tmp89fm42
Manufacturer Part Number
tmp89fm42
Description
8 Bit Microcontroller
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP89FM42.pdf
(408 pages)
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2.4 Reset Control Circuit
2. CPU Core
RA001
2.4.4.8
2.4.4.9
tor reset, except the power-on reset, the factor which causes a reset can be detected.
reset.
factor reset detection status register is clear to "0". IRSTSR<FCLR> is cleared to "0" automatically after
initializing the internal factor reset detection status register.
power is turned on and the warm-up operation that follows reset release is finished.
and connect a pull-up resistor for a port. Then set SYSCR3<RSTDIS> to "1" and write 0xB2 to SYSCR4.
This disables the external reset function and makes the external reset input pin usable as a normal port.
connect the pull-up resistor to put the pin to the input mode. Then clear SYSCR3<RSTDIS> to "0" and
write 0xB2 to SYSCR4. This enables the external reset function and makes the pin usable as the external
reset input pin.
Internal factor reset detection status register
How to use the external reset input pin as a port
By reading the internal factor reset detection status register IRSTSR after the release of an internal fac-
The internal factor reset detection status register is initialized by an external reset input or power-on
Set IRSTSR<FCLR> to "1" and write 0x71 to SYSCR4. This enables IRSTSR<FCLR> and the internal
Note 1: Care must be taken in system designing since the IRSTSR may not fulfill its functions due to disturb-
Note 2: After IRSTSR<FCLR> is modified, SYSCR4 should be written 0x71 (Enable code for
To use the external reset input pin as a port, keep the external reset input pin at the "H" level until the
After the warm-up operation that follows reset release is finished, set P1PU0 to "1" and P1CR0 to "0",
To use the pin as an external reset pin when it is used as a port, set P1PU0 to "1" and P1CR0 to "0" and
Note 1: If you switch the external reset input pin to a port or switch the pin used as a port to the external reset
Note 2: If the external reset input is used as a port, the statement which clears SYSCR3<RSTDIS> to "0" is
Note 3: After SYSCR3<RSTDIS> is modified, SYSCR4 should be written 0xB2 (Enable code for
ing noise and other effects.
IRSTSR<FCLR> in NORMAL mode when fcgck is fc/4 (CGCR<FCGCKSEL>=00). Otherwise,
IRSTSR<FCLR> may be enabled at unexpected timing.
input pin, do it when the pin is stabilized at the "H" level. Switching the pin function when the "L" level
is input may cause a reset.
not written in a program. By the abnormal execution of program, the external reset input set as a port
may be changed as the external reset input at unexpected timing.
SYSCR3<RSTDIS>) in NORMAL1 mode when fcgck is fc/4 (CGCR<FCGCKSEL>=00). Otherwise,
SYSCR3<RSTDIS> may be enabled at unexpected timing.
Page 44
TMP89FM42
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