S3C72G9 Samsung semiconductor, S3C72G9 Datasheet - Page 7

• Manufacturer Part Number: S3C72G9
• Description: The S3C72G9 single-chip CMOS microcontroller has been designed for high performance using Samsungs newest 4-bit CPU core/ SAM47 (Samsung Arrangeable M
• Manufacturer: Samsung semiconductor

 

A machine cycle is defined as one cycle of the selected CPU clock. Three different clock rates can be selected
using the PCON register.
In this document, the letter 'S' is used in tables when describing the number of additional machine cycles required
for an instruction to execute, given that the instruction has a skip function ('S' = skip). The addition number of
machine cycles that will be required to perform the skip usually depends on the size of the instruction being
skipped — whether it is a 1-byte, 2-byte, or 3-byte instruction. A skip is also executed for SMB and SRB
instructions.
The values in additional machine cycles for 'S' for the three cases in which skip conditions occur are as follows:
Case 1: No skip
Case 2: Skip is 1-byte or 2-byte instruction
Case 3: Skip is 3-byte instruction

Register
Table 5-7. Opcode Definitions (Direct)
WX
EA
HL
YZ
W
H
A
E
X
Z
Y
L
r2
0
0
0
0
1
1
1
1
0
0
1
1
r1
0
0
1
1
0
0
1
1
0
1
0
1
r0
0
1
0
1
0
1
0
1
0
0
0
0
S = 0 cycles
S = 1 cycle
S = 2 cycles

Table 5-8. Opcode Definitions (Indirect)
Register
@WX
@WL
@HL
i2
1
1
1

 


i1
0
1
1
i0
1
0
1