em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 69

• Manufacturer Part Number: em78f644nso28s
• Description: Flash Series 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.0) 05.05.2010
(This specification is subject to change without further notice)
6.3.15 Bank0 R12: LVDCR (Low Voltage Detector Control
Bits 7~4:
Bit 3 (LVDEN): Low voltage detector enable bit
Bit 2 (/LVD):
Bits1~0 (LVD1~LVD0): Low voltage detector level select bits
6.3.16 Bank0 R13: TCCCR (TCC Control Register)
Bit 7:
Bit 6 (TCCS): TCC Clock Source Select Bit
Bit 5 (TS):
Bit 4 (TE):
Bit 7
Bit 7
0
0
TCCS
Bit 6
Bit 6
0
Not used, fixed to “0” all the time.
0: LVD disable
1: LVD enable
Low voltage detector. This is a read only bit. When the VDD pin
voltage is lower than LVD voltage interrupt level (which is set by
LVD1 and LVD0), this bit will be cleared.
0: The low voltage is detected
1: The low voltage is not detected or LVD function is disabled
Not used, fixed to “0” all the time.
0: Fs (sub clock)
1: Fm (main clock)
TCC Signal Source
0: Internal oscillator cycle clock. If P77 is used as I/O pin,
1: Transition on the TCC pin
TCC Signal Edge
0: Increment if the transition from low to high takes place on the
1: Increment if the transition from high to low takes place on the
LVD1
TS must be “0”.
TCC pin;
TCC pin.
0
0
1
1
Bit 5
Bit 5
TS
0
LVD0
0
1
0
1
EM78F648/644/642/641/548/544/542/541N
Bit 4
Bit 4
TE
Register)
0
LVD Voltage Interrupt Level
LVDEN
PSTE
Bit 3
Bit 3
2.3
3.3
4.0
4.5
PST2
Bit 2
/LVD
Bit 2
8-Bit Microcontroller
LVD1
PST1
Bit 1
Bit 1
LVD0
PST0
Bit 0
Bit 0
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