Z0847006PSG Zilog, Z0847006PSG Datasheet - Page 26

• Manufacturer Part Number: Z0847006PSG
• Description: IC 6MHZ Z80 NMOS DART 40-DIP
• Manufacturer: Zilog
• Series: Z80r

Specifications of Z0847006PSG

• Processor Type: Z80
• Features: Dual Channel Asynchronous Receiver/Transmitter (DART)
• Speed: 6MHz
• Voltage: 5V
• Mounting Type: Through Hole
• Package / Case: 40-DIP (0.620", 15.75mm)
• Mounting Style: Through Hole
• Cpu Speed: 6MHz
• Digital Ic Case Style: DIP
• No. Of Pins: 40
• Supply Voltage Range: 5V
• Operating Temperature Range: 0°C To +70°C
• Svhc: No SVHC (18-Jun-2010)
• Base Number: 847006
• Rohs Compliant: Yes
• Clock Frequency: 6MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant


UM008101-0601
<   % 2 7 2 G T K R J G T C N U
7 U G T / C P W C N
A CTC channel may be programmed to request an interrupt every time its
down-counter reaches a count of zero. However, using this feature requires
that the CPU be in INTERRUPT Mode 2. After the interrupt request, the
CPU sends out an interrupt acknowledge. The CTC’s interrupt control
logic determines the highest-priority channel requesting an interrupt. If
the CTC’s IEI input is active, indicating that it has priority within the
system daisy-chain, it places an 8-bit interrupt vector on the system data
bus as follows:
1. The high order five bits of this vector were written to the CTC earlier
2. The next two bits are provided by the CTC’s interrupt control logic as a
3. The low-order bit of the vector is always zero according to a
This interrupt vector is used to form a pointer to a location in memory
where the address of the interrupt service routine is stored in a table. The
vector represents the least-significant eight bits. The CPU reads the
contents of the I register to provide the most-significant eight bits of the
16-bit pointer. The address pointed to in memory contains the low-order
byte and the next highest address contains the high-order byte of an
address, which in turn contains the first Op Code of the interrupt service
routine. Thus, in Mode 2, a single 8-bit vector stored in an interrupting
CTC can result in an indirect call to any memory location (Figure 3).
Figure 3.
Z80 16-Bit Pointer (Interrupt Starting Address)
as part of the CTC initial programming process.
binary code corresponding to the highest-priority channel requesting an
interrupt.
convention (Figure 3).
Contents
1 Reg
Z80 16-Bit Pointer (Interrupt Starting Address)
7 Bits from
Peripheral
Vector
0
Counter/Timer Channels