Page 44
2. CPU Core
2.4 Reset Control Circuit
TMP89FM42
RA001
2.4.4.8
Internal factor reset detection status register
By reading the internal factor reset detection status register IRSTSR after the release of an internal fac-
tor reset, except the power-on reset, the factor which causes a reset can be detected.
The internal factor reset detection status register is initialized by an external reset input or power-on
reset.
Set IRSTSR<FCLR> to "1" and write 0x71 to SYSCR4. This enables IRSTSR<FCLR> and the internal
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.
Note 1: Care must be taken in system designing since the IRSTSR may not fulfill its functions due to disturb-
ing noise and other effects.
Note 2: After IRSTSR<FCLR> is modified, SYSCR4 should be written 0x71 (Enable code for
IRSTSR<FCLR> in NORMAL mode when fcgck is fc/4 (CGCR<FCGCKSEL>=00). Otherwise,
IRSTSR<FCLR> may be enabled at unexpected timing.
2.4.4.9
How to use the external reset input pin as a port
To use the external reset input pin as a port, keep the external reset input pin at the "H" level until the
power is turned on and the warm-up operation that follows reset release is finished.
After the warm-up operation that follows reset release is finished, set P1PU0 to "1" and P1CR0 to "0",
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.
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
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.
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
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.
Note 2: If the external reset input is used as a port, the statement which clears SYSCR3<RSTDIS> to "0" is
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.
Note 3: After SYSCR3<RSTDIS> is modified, SYSCR4 should be written 0xB2 (Enable code for
SYSCR3<RSTDIS>) in NORMAL1 mode when fcgck is fc/4 (CGCR<FCGCKSEL>=00). Otherwise,
SYSCR3<RSTDIS> may be enabled at unexpected timing.
Summary of Contents for TLCS-870/C1 Series
Page 1: ...8 Bit Microcontroller TLCS 870 C1 Series TMP89FM42 查询TMP89FM42供应商 捷多邦 专业PCB打样工厂 24小时加急出货 ...
Page 3: ...Revision History Date Revision 2007 10 25 1 First Release 2007 11 3 2 Contents Revised ...
Page 4: ......
Page 14: ......
Page 18: ...1 3 Block Diagram TMP89FM42 1 3 Block Diagram Figure 1 2 Block Diagram ...
Page 22: ...1 4 Pin Names and Functions TMP89FM42 ...
Page 60: ...2 CPU Core 2 5 Revision History TMP89FM42 ...
Page 76: ...3 Interrupt Control Circuit 3 8 Revision History TMP89FM42 ...
Page 86: ...4 External Interrupt control circuit 4 3 Function TMP89FM42 ...
Page 102: ...7 Voltage Detection Circuit 7 5 Revision History TMP89FM42 ...
Page 126: ...8 I O Ports 8 3 I O Port Registers TMP89FM42 Note 2 i 0 to 1 ...
Page 136: ...8 I O Ports 8 5 Revision History TMP89FM42 ...
Page 142: ...9 Special Function Registers 9 3 SFR3 0x0E40 to 0x0EFF TMP89FM42 ...
Page 146: ...10 Low Power Consumption Function for Peripherals TMP89FM42 ...
Page 149: ...TMP89FM42 11 3 Revision History Rev Description RA001 Deleted SLEEP2 description ...
Page 150: ...11 Divider Output DVO 11 3 Revision History TMP89FM42 ...
Page 220: ...15 Real Time Clock RTC 15 4 Real Time Clock Operation TMP89FM42 ...
Page 250: ...16 Asynchronous Serial Interface UART 16 15 Revision History TMP89FM42 ...
Page 302: ...18 Serial Bus Interface SBI 18 7 Revision History TMP89FM42 ...
Page 338: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 ...
Page 384: ...22 Serial PROM Mode 22 15 Revision History TMP89FM42 ...
Page 388: ...24 Input Output Circuit 24 1 Control Pins TMP89FM42 ...
Page 404: ...25 Electrical Characteristics 25 11 Revision History TMP89FM42 ...
Page 406: ...26 Package Dimensions TMP89FM42 ...
Page 408: ......