Z16C3516VSG Zilog, Z16C3516VSG Datasheet - Page 133

• Manufacturer Part Number: Z16C3516VSG
• Description: IC 16MHZ Z8500 CMOS ISCC 68-PLCC
• Manufacturer: Zilog
• Series: IUSC™r

Specifications of Z16C3516VSG

• Controller Type: Serial Communications Controller (SCC)
• Interface: USB
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 50mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 68-LCC (J-Lead)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 269-4690-5; Z16C3516VSG

UM011001-0601
The SCC uses /INTACK (Interrupt Acknowledge) for
recognition of an interrupt acknowledge cycle. This pin,
used with /RD, allows the SCC to gate its interrupt vector
onto the data bus. An active /RD signal during an interrupt
acknowledge cycle performs two functions. First, it allows
Interrupt Condition
Active
Set
INT
IP
IEI High?
/INTACK * IEI * /RD
Wait For CPU
/INTACK Cycle
Figure 12. SCC Interrupt Status Diagram
the highest priority device requesting an interrupt to place
its vector on the data bus. Secondly, it sets the IUS bit in
the highest priority device to show the device is now under
service.
Return To Main Program
Cleared
Cleared
IUS
IUS
Set
IP
The Z180™ Interfaced with the SCC at MHZ
CPU Read, Write, or Reset
IEO High?
Application Note
7-13
7