em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 81

• 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)
Bit 0 (CP2NRDT): Comparator 2 Noise Rejection Delay Time.
6.3.44 Bank0 R3C: CMP2CR (Comparator 2 Control Register)
Bit 7 (C2RS):
Bit 6 (CP2OUT): The result of Comparator 2 output
Bits 5~4 (CMP1COS1~CMP1COS0): Comparator 2/OP2 select bits
Bit 2 (CP2PS):
Bit 1 (CP2NRE): Noise Rejection Enable bit for Comparator 2
Bit 3 (CP2NS):
C2RS
Bit 7
CP2OUT CMP2COS1 CMP2COS0 CP2NS
Bit 6
Comparator 2 input reference source select bit
0: CIN2+ source external
1: CIN2+ source internal
Negative end of Comparator 2 is connected to ground.
0: disable, P82/CIN2- as CIN2-.
1: enable, P82/CIN2- as P82
Positive end of Comparator 2 is connected to ground.
0: disable, P81/CIN2+ as CIN2+.
1: enable, P81/CIN2+ as P81
0: Disable noise rejection
1: Enable noise rejection (default). But in Low Crystal 2 Oscillator
(LXT2) mode, Green mode, and Idle mode, the noise rejection
circuits are always disabled.
In Low XTAL1 oscillator (LXT1) mode, the noise rejection high/low
pulse is always 4/Fm.
0: Comparator1 output H/L pulse equal to 4/Fm (0.5us at 8MHz) is
1: Comparator1 output H/L pulse equal to 8/Fm (1us at 8MHz) is
CMP2COS1 CMP2COS0
considered as signal.
considered as signal.
Bit 5
0
0
1
1
EM78F648/644/642/641/548/544/542/541N
Bit 4
0
1
0
1
Bit 3
Comparator2 not used. P80, P81, P82
act as normal I/O pin
P81, P82, act as an Comparator2 input
pin and P80 acts as normal I/O pin
P81, P82 act as an Comparator2 input
pin and P80 acts as Comparator2
output pin (CO2).
reserved
Function Description
CP2PS
Bit 2
8-Bit Microcontroller
CP2NRE CP2NRDT
Bit 1
Bit 0
• 71