Z84C9008VSG Zilog, Z84C9008VSG Datasheet - Page 275

• Manufacturer Part Number: Z84C9008VSG
• Description: IC 8MHZ Z80 KIO 84-PLCC
• Manufacturer: Zilog
• Series: Z80r

Specifications of Z84C9008VSG

• Processor Type: Z80
• Features: Serial/Parallel Input/Output, Counter/Timer Circuit
• Speed: 8MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 84-LCC (J-Lead)
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Cpu Speed: 8MHz
• Digital Ic Case Style: LCC
• No. Of Pins: 84
• Supply Voltage Range: 5V
• Operating Temperature Range: 0°C To +70°C
• Svhc: No SVHC (18-Jun-2010)
• Rohs Compliant: Yes
• Base Number: 84
• Clock Frequency: 8MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Operation:
Op Code:
Operands:
Description: The current contents of the Program Counter (PC) are pushed onto the top
Condition Bits Affected: None
UM008005-0205
Call And Return Group
(SP-1) ← PCH, (SP-2) ← PCL, PC ← nn
CALL
nn
The first of the two n operands in the assembled object code above is the
least-significant byte of a 2-byte memory address.
of the external memory stack. The operands
point to the address in memory where the first Op Code of a subroutine is to
be fetched. At the end of the subroutine, a RETurn instruction can be used
to return to the original program flow by popping the top of the stack back
to the PC. The push is accomplished by first decrementing the current
contents of the Stack Pointer (register pair SP), loading the high-order byte
of the PC contents to the memory address now pointed to by the SP; then
decrementing SP again, and loading the low order byte of the PC contents
to the top of stack.
Because this is a 3-byte instruction, the Program Counter was incremented
by three before the push is executed.
1
1
M Cycles
0
5
0
n
n
1
CALL nn
17 (4, 3, 4, 3, 3)
1
T States
0
1
CD
nn
4 MHz E.T.
are then loaded to the PC to
4.25
Z80 Instruction Set
User’s Manual
Z80 CPU
255