em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 64

• 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
54 •
Bit 3 (P): Power down bit
Bit 2 (Z): Zero flag
Bit 1 (DC):
Bit 0 (C): Carry flag
6.3.5 R4: RSR (RAM Select Register)
Bit 7~0 (RSR7~RSR0): These bits are used to select registers (Address: 00~FF) in
6.3.6 Bank0 R5 ~ R9 (Port 5 ~ Port 9)
R5, R6, R7, R8, & R9 are I/O data registers.
6.3.7 Bank0 RA (Not Used)
6.3.8 Bank0 RB OMCR (Operating Mode Control Register)
Bit 7 (CPUS): CPU Oscillator Source Select.
Bit 6 (IDLE): Idle mode enable bit.` This bit defines and instruct SLEP instruction
CPUS
RSR7
Bit 7
Bit 7
Set to “1” at power on or by "WDTC" command execution. Reset to “0” by
“SLEP” command execution.
indirect address mode. Refer to the table on Data Memory Configuration
(Section 6.3.3) for more details.
0: Fs: sub-oscillator for WDT internal RC time base
1: Fm: main-oscillator
When CPUS=0, the CPU oscillator will select sub-oscillator and the main
oscillator is stopped.
which mode to go after the instruction is executed.
0: “IDLE=0”+SLEP instruction => Sleep mode
1: “IDLE=1”+SLEP instruction => Idle mode
Set to "1" if the result of an arithmetic or logic operation is zero.
RSR6
IDLE
Bit 6
Bit 6
Auxiliary carry flag
TC1SS
RSR5
Bit 5
Bit 5
TC2SS
RSR4
Bit 4
Bit 4
(This specification is subject to change without further notice)
TC3SS
RSR3
Bit 3
Bit 3
Product Specification (V1.0) 05.05.2010
RSR2
TASS
Bit 2
Bit 2
RSR1
TBSS
Bit 1
Bit 1
RSR0
Bit 0
Bit 0
0