Z8S180 Zilog., Z8S180 Datasheet - Page 29
Z8S180
Manufacturer Part Number
Z8S180
Description
ENHANCED Z180 MICROPROCESSOR
Manufacturer
Zilog.
Datasheet
1.Z8S180.pdf
(326 pages)
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14
UM005001-ZMP0400
Z 8018x Fam il y
M PU Us e r M anual
Central Processing Unit
The CPU is microcoded to provide a core that is object code compatible
with the Z80 CPU. It also provides a superset of the Z80 instruction set,
including 8-bit multiply and divide. This core has been enhanced to allow
many of the instructions to execute in fewer clock cycles.
DMA Controller
The DMA controller provides high speed transfers between memory and
I/O devices. Transfer operations supported are memory-to-memory,
memory to/from I/O and I/O to I/O. Transfer modes supported are
REQUEST, BURST, and CYCLE STEAL. DMA transfers can access the
full 1MB addressing range with a block length up to 64KB, and can cross
over 64K boundaries.
Asynchronous Serial Communications Interface (ASCI)
The ASCI logic provides two individual full-duplex UARTs. Each
channel includes a programmable baud rate generator and modem control
signals. The ASCI channels can also support a multiprocessor
communications format.
Programmable Reload Timer (PRT)
This logic consists of two separate channels, each containing a 16-bit
counter (timer) and count reload register. The time base for the counters is
derived from the system clock (divided by 20) before reaching the
counter. PRT channel 1 provides an optional output to allow for
waveform generation.
Clocked Serial I/O (CSIO)
The CSIO channel provides a half-duplex serial transmitter and receiver.
This channel can be used for simple high-speed data connection to
another microprocessor or microcomputer.
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