Z85C3008VSG Zilog, Z85C3008VSG Datasheet - Page 157

• Manufacturer Part Number: Z85C3008VSG
• Description: IC 8MHZ Z8500 CMOS SCC 44-PLCC
• Manufacturer: Zilog
• Series: SCCr

Specifications of Z85C3008VSG

• Processor Type: Z80
• Features: Error Detection and Multiprotocol Support
• Speed: 8MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 44-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: 44
• Supply Voltage Range: 5V
• Operating Temperature Range: 0°C To +70°C
• Svhc: No SVHC (18-Jun-2010)
• Base Number: 85
• Rohs Compliant: Yes
• Clock Frequency: 8MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 269-3932; Z85C3008VSG

Application Note
Interfacing Z80
SOFTWARE CONSIDERATIONS - POLLED OPERATION
There are several options available for servicing interrupts
on the Z8500 peripherals. Since the vector of IP registers
can be read at any time, software can be used to emulate
the Z80 interrupt response. The interrupt vector read
reflects the interrupt status condition even if the device is
Z80 Vector Interrupt Response, Emulation by
Software
;This code emulates the Z80 vector interrupt
;operation by reading the device interrupt
;vector and forming an address from a vector
;table. It then executes an indirect jump to
;the interrupt service routine.
INDX: LD
VECTAB:
6-22
OUT
IN
INC
RET
AND
LD
LD
LD
ADD
LD
INC
LD
LD
JP
DEFW
DEFW
DEFW
DEFW
DEFW
DEFW
DEFW
DEFW
®
CPUs to the Z8500 Peripheral Family
A,CIVREG
(CTRL), A
A, (CTRL)
A
Z
00001110B
E,A
D,0
HL,VECTAB
HL,DE
A, (HL)
HL
H, (HL)
L,A
(HL)
INT1
INT2
INT3
INT4
INT5
INT6
INT7
INT8
;WRITE REG. PTR.
;READ VECT. REG.
;VALID VECTOR?
;NO INT - RETURN
;MASK OTHER BITS
;FORM INDEX VALUE
;ADD VECT. TABLE ADDR.
;GET LOW BYTE
;GET HIGH BYTE
;FORM ROUTINE ADDR.
;JUMP TO IT
;CURRENT INT. VECT. REG
programmed to return to vector that does not reflect the
status change (SAV or VIS is not set). The code below is
a simple software routine that emulates the Z80 vector
response operation.
UM010901-0601