em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 170

• 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
160 •
HLFS
Bit14 Bit13 Bit12 Bit11 Bit10
-
SHE
6.19.2.2 EM78F648/548N Code Option Word 1
Bit 14(HLFS):
Bit 13:
Bit 12 (SHE):
Bits 11~7(C4~C0): IRC trim bits. This part will be auto setup by the writer
Bits 6~5 (RCM1~RCM0): IRC frequency selection bits
Bit 4:
Bits 3~1 (OSC2~OSC0): Oscillator mode selection bits
Bit 0 (RCOD):
C4
C3
Bit9
C2
Initialize CPU operation mode
0: Normal mode
1: Green mode
Not used, set to “1” all the time.
System halt enable bit.
0: Disable
1: Enable
Not used, set to “1” all the time.
Oscillator output or I/O port selection bit
XT (XTAL oscillator mode)
HXT (High XTAL oscillator mode)
LXT1 (Low XTAL1 oscillator mode)
LXT2 (Low XTAL2 oscillator mode)
IRC mode, OSCO (P54) act as I/O pin
IRC mode, OSCO (P54) act as RCOUT pin
ERC mode, OSCO (P54) act as I/O pin
ERC mode, OSCO (P54) act as RCOUT pin
RCOD
1
0
Bit8
C1
RCM 1
0
0
1
1
Word 1
OSCO pin is open drain
OSCO output system clock (default)
Bit7
C0
(This specification is subject to change without further notice)
Mode
RCM1 RCM0
Bit6
Pin Function
Bit5
Product Specification (V1.0) 05.05.2010
RCM 0
0
1
0
1
Bit4
-
OSC2 OSC1 OSC0 RCOD
Bit3
OSC2
0
0
0
0
1
1
1
1
Frequency (MHz)
Bit2
4 (default)
OSC1
455kHz
0
0
1
1
0
0
1
1
Bit1
16
8
OSC0
Bit0
0
1
0
1
0
1
0
1