ZLF645S2864GP0001T Maxim Integrated, ZLF645S2864GP0001T Datasheet - Page 169
ZLF645S2864GP0001T
Manufacturer Part Number
ZLF645S2864GP0001T
Description
8-bit Microcontrollers - MCU Crimzon Flash Infrared MCU
Manufacturer
Maxim Integrated
Datasheet
1.ZLF645E0H4864G2204.pdf
(201 pages)
Specifications of ZLF645S2864GP0001T
Core
Z8
Data Bus Width
8 bit
Maximum Clock Frequency
8 MHz
Program Memory Size
64 KB
Data Ram Size
1 KB
Operating Supply Voltage
2 V to 3.6 V
Interface Type
UART
Number Of Programmable I/os
5
Number Of Timers
2 x 8 bit, 1 x 16 bit
Processor Series
ZLF645
Program Memory Type
Flash
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19-4572; Rev 0; 4/09
Table 77. Condition Codes
Bit Position
[3]
[2]
[1]
[0]
Binary
0000
0001
0010
0011
0100
0101
0110
0110
Condition Codes
Hex
The C, Z, S, and V flags control the operation of the conditional jump (JP cc and JR cc)
instructions. Sixteen frequently useful functions of the flag settings are encoded in a 4-bit
field called the condition code (cc).
binary condition codes can be created using more than one assembly code mnemonic. The
result of the flag test operation determines if the conditional jump executes.
0
1
2
3
4
5
6
6
Value
0
1
0
1
0
1
0
1
Assembly
Mnemonic
F
LT
LE
ULE
OV
Ml
Z
EQ
Description
Decimal Adjust Flag (D)
Used for binary-coded decimal (BCD) arithmetic.
Flag Clear
Flag Set
Half Carry Flag (H)
Set when a carry out of or borrow into bit 3 of an arithmetic operation occurs.
Flag Clear
Flag Set
User Flag 1 (F1)
Available to software for use as a general-purpose bit.
Bit Clear
Bit Set
User Flag 2 (F2)
Available to software for use as a general-purpose bit.
Bit Clear
Bit Set
Definition
Always False
Less than
Less than or Equal
Unsigned Less than or Equal
Overflow
Minus
Zero
Equal
Table 77
summarizes the condition codes. Some
ZLF645 Series Flash MCUs
Flag Test Operation
–
(S XOR V) = 1
(Z OR (S XOR V)) = 1
(C OR Z) = 1
V = 1
S = 1
Z = 1
Z = 1
Product Specification
Condition Codes
161
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