em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 80

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

EM78F648/644/642/641/548/544/542/541N
8-Bit Microcontroller
70 •
Bit 0 (CP1NRDT): Comparator 1 Noise Rejection Delay Time.
Bits 5~4(CMP1COS1~CMP1COS0): Comparator 1/OP1 select bits
Bit 2 (CP1PS):
Bit 1 (CP1NRE): Noise Rejection Enable bit for Comparator 1
6.3.43 Bank0 R3A~R3B: (Not Used)
Bit 3 (CP1NS):
Negative end of Comparator 1 is connected to ground.
0: Disable, P72/CIN1- functions as CIN1-.
1: Enable, P72/CIN1- functions as P72
Positive end of Comparator 1 is connected to ground.
0: Disable, P71/CIN1+ functions as CIN1+.
1: Enable, P71/CIN1+ functions as P71
0: Disable noise rejection
1: Enable noise rejection (default)
In Low XTAL1 oscillator (LXT1) mode, the noise rejection high/low
pulse is always 4/Fm.
0: Comparator 1 output H/L pulse equal to 4/Fm (0.5us at 8MHz) is
1: Comparator 1 output H/L pulse equal to 8/Fm (1us at 8MHz) is
CMP1COS1
0
0
1
1
considered as signal.
considered as signal.
In Low Crystal 2 Oscillator (LXT2) mode, Green mode, and Idle
mode, the noise rejection circuits are always disabled.
CMP1COS0
0
1
0
1
(This specification is subject to change without further notice)
Product Specification (V1.0) 05.05.2010
Function Description
Comparator 1 not used. P70, P71, & P72 act as normal I/O pin
P71 & P72 function as Comparator 1 input pin and P70 functions as normal I/O pin
P71 & P72 function as Comparator 1 input pin and P70 functions as Comparator 1 output pin (CO1).
Reserved
NOTE