Z8523008PSG Zilog, Z8523008PSG Datasheet - Page 76

• Manufacturer Part Number: Z8523008PSG
• Description: IC 8MHZ ESCC 40-DIP
• Manufacturer: Zilog

Specifications of Z8523008PSG

• Controller Type: Serial Communications Controller (SCC)
• Interface: Bus
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 4mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 40-DIP (0.620", 15.75mm)
• Operating Supply Voltage: 5 V
• Supply Current (max): 9 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: Through Hole
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 269-3917; Z8523008PSG

PS005303-0907
Z80230 Read Cycle Timing
Z80230 Interrupt Acknowledge Cycle Timing
The Read Cycle Timing for the Z80230 is illustrated in
A7-A0, as well as the state of CS0 and INTACK, are latched by the rising edge of AS.
R/W must be High before DS falls to indicate a Read cycle. The Z80230 data bus drivers
are enabled while CS1 is High and DS is Low.
The Interrupt Acknowledge cycle timing for the Z80230 is illustrated in
72. The address on A7-A0 and the state of CS0 and INTACK are latched by the rising -
edge of AS. However, if INTACK is Low. The address on A7-A0, CS0, CS1 and R/W are
ignored for the duration of the interrupt acknowledge cycle.
The Z80230 samples the state of INTACK on the rising edge of AS, and AC parameters.
Parameters 7 and 8 of
Between the rising edge of AS and the falling edge of DS, the internal and external daisy
chains settle, as specified in parameter 29). A system with no external daisy chain pro-
vides the time priority internal to the ESCC. Systems using an external daisy chain must
refer to Note 5 of
If there is an interrupt pending in the ESCC, and IEI is High when DS falls, the acknowl-
edge cycle is intended for the ESCC. Consequently, the Z80230 sets the Interrupt Under
Service (IUS) latch for the highest priority pending interrupt, and places an interrupt vec-
INTACK
A7–A0
CS0
R/W
CS1
DS
AS
Figure 18. Z80230 Read Cycle Timing
Table
Table 44
Address
44, for the time required to settle the daisy chain.
on page 82, specify the setup and hold time requirements.
Figure
Data Valid
18. The register address on
Product Specification
Z80230 Interface Timing
Figure 19
Z85230/Z80230
on page
71