em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 172

• 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
162 •
Case (A) is selected by the Code Option bit called CLK1:0. One instruction cycle
consists of two oscillator clocks if CLK1:0 is ”01”, and four oscillator clocks if CLK1:0
is ”00”.
Note that once the four oscillator periods within one instruction cycle is selected as in
Case (A), the internal clock source to TCC should be CLK = Fosc/4, instead of
Fosc/2, as indicated in Figure 6-11 in Section 6.4, TCC/WDT and Prescaler.
In addition, the Instruction Set also has the following features:
1) Every bit of any register can be set, cleared, or tested directly.
2) The I/O register can be regarded as general register. That is, the same instruction
In addition, the instruction set has the following features:
1) Every bit of any register can be set, cleared, or tested directly.
2) The I/O register can be regarded as general register. That is, the same instruction
6.20.1 Instruction Set Table
In the following symbols are used in the Instruction Set table shown below:
"R" represents a register designator that specifies which one of the registers
"b" represents a bit field designator that selects the value for the bit which is located
"k" represents an 8 or 10-bit constant or literal value.
can operate on I/O register.
(including operational registers and general purpose registers) is to be utilized by
the instruction.
in the register "R", and affects operation.
can operate on the I/O register.
(This specification is subject to change without further notice)
Product Specification (V1.0) 05.05.2010