Page 83
TMP89FM42
RA002
7.3.1
Enabling/disabling the voltage detection operation
Setting VDCR2<VDxEN> to "1" enables the voltage detection operation. Setting it to "0" disables the oper-
ation.
VDCR2<VDxEN> is cleared to "0" immediately after a power-on reset or a reset by an external reset input is
released.
Note:When the supply voltage (VDD) is lower than the detection voltage (VDxLVL), setting VDCR2<VDxEN> to "1"
generates a voltage detection interrupt request signal or a voltage detection reset signal at the time.
7.3.2
Selecting the voltage detection operation mode
If the voltage detection operation mode is set to generate voltage detection interrupt request signals
(VDCR1<VDxMOD>="0") and VDCR2<VDxEN> is set to "1", a voltage detection interrupt request signal is
generated when the supply voltage (VDD) becomes lower than the detection voltage (VDxLVL).
If the voltage detection operation mode is set to generate voltage detection reset signals (VDCR1<VDx-
MOD>="1") and VDCR2<VDxEN> is set to "1", a voltage detection reset signal is generated when the supply
voltage (VDD) becomes lower than the detection voltage (VDxLVL).
VDCR1 and VDCR2 are initialized by a power-on reset or an external reset input only. Therefore, the volt-
age detection reset signals are generated continuously, as long as the supply voltage (VDD) is lower than the
detection voltage (VDxLVL).
Note:If the voltage detection mode is set to generate voltage detection interrupt request signals and the supply volt-
age (VDD) becomes lower than the detection voltage (VDxLVL) in the STOP, IDLE0 or SLEEP0 mode, a volt-
age detection interrupt request signal is generated after the operation mode is released and returned to
NORMAL or SLOW mode.
Figure 7-2 Voltage Detection Interrupt Request Signal and Voltage Detection Reset Signal
7.3.3
Selecting the detection voltage level
Select a detection voltage at VDCR1<VDxLVL>.
7.3.4
Voltage detection flag and voltage detection status flag
The magnitude relation between the supply voltage (VDD) and the detection voltage (VDxLVL) can be
checked by reading VDCR1<VDxF> and VDCR1<VDxSF>.
If VDCR2<VDxEN> is set at "1", when the supply voltage (VDD) becomes lower than the detection voltage
(VDxLVL), VDCR1<VDxF> is set to "1" and is held in this state. VDCR1<VDxF> is not cleared to "0" when
the supply voltage (VDD) becomes equal to or higher than the detection voltage (VDxLVL).
When VDCR2<VDxEN> is cleared to "0" after VDCR1<VDxF> is set to "1", the previous state is still held.
To clear VDCR1<VDxF>, "0" must be written to it.
Detection voltage level
VDD level
Voltage detection interrupt
request signal
VDCR2<VDxEN>
Voltage detection reset signal
Содержание TLCS-870/C1 Series
Страница 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 ...
Страница 3: ...Revision History Date Revision 2007 10 25 1 First Release 2007 11 3 2 Contents Revised ...
Страница 4: ......
Страница 14: ......
Страница 18: ...1 3 Block Diagram TMP89FM42 1 3 Block Diagram Figure 1 2 Block Diagram ...
Страница 22: ...1 4 Pin Names and Functions TMP89FM42 ...
Страница 60: ...2 CPU Core 2 5 Revision History TMP89FM42 ...
Страница 76: ...3 Interrupt Control Circuit 3 8 Revision History TMP89FM42 ...
Страница 86: ...4 External Interrupt control circuit 4 3 Function TMP89FM42 ...
Страница 102: ...7 Voltage Detection Circuit 7 5 Revision History TMP89FM42 ...
Страница 126: ...8 I O Ports 8 3 I O Port Registers TMP89FM42 Note 2 i 0 to 1 ...
Страница 136: ...8 I O Ports 8 5 Revision History TMP89FM42 ...
Страница 142: ...9 Special Function Registers 9 3 SFR3 0x0E40 to 0x0EFF TMP89FM42 ...
Страница 146: ...10 Low Power Consumption Function for Peripherals TMP89FM42 ...
Страница 149: ...TMP89FM42 11 3 Revision History Rev Description RA001 Deleted SLEEP2 description ...
Страница 150: ...11 Divider Output DVO 11 3 Revision History TMP89FM42 ...
Страница 220: ...15 Real Time Clock RTC 15 4 Real Time Clock Operation TMP89FM42 ...
Страница 250: ...16 Asynchronous Serial Interface UART 16 15 Revision History TMP89FM42 ...
Страница 302: ...18 Serial Bus Interface SBI 18 7 Revision History TMP89FM42 ...
Страница 336: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 Note 1 Make sure that you set the C register to 0x00 LD FLSCR2 0xD5 ...
Страница 338: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 ...
Страница 384: ...22 Serial PROM Mode 22 15 Revision History TMP89FM42 ...
Страница 388: ...24 Input Output Circuit 24 1 Control Pins TMP89FM42 ...
Страница 404: ...25 Electrical Characteristics 25 11 Revision History TMP89FM42 ...
Страница 406: ...26 Package Dimensions TMP89FM42 ...
Страница 408: ......