z80189 ZiLOG Semiconductor, z80189 Datasheet - Page 28

• Manufacturer Part Number: z80189
• Description: Z80180, Z8s180, Z8l180 Mpu Operation
• Manufacturer: ZiLOG Semiconductor

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Other Z8X180 family members (such as Z80183, Z80S183, Z80185/195)
feature, in addition to these blocks, additional peripherals and are covered
in their associated Product Specification
Clock Generator
This logic generates the system clock from either an external crystal or
clock input. The external clock is divided by two and provided to both
internal and external devices.
Bus State Controller
This logic performs all of the status and bus control activity associated
with both the CPU and some on-chip peripherals. This includes Wait State
timing, RESET cycles, DRAM refresh, and DMA bus exchanges.
Interrupt Controller
This block monitors and prioritizes the variety of internal and external
interrupts and traps to provide the correct responses from the CPU. To
remain compatible with the Z80 CPU, three different interrupt modes are
supported.
Memory Management Unit
The MMU allows the user to map the memory used by the CPU (logically
only 64K) into the 1MB addressing range supported by the Z8X180. The
organization of the MMU object code features compatibility with the Z80
CPU while offering access to an extended memory space. This capability
is accomplished by using an effective common area - banked area
scheme.
Programmable Reload Timers (PRT, 2 channels)
Clock Serial I/O (CSIO) channel.
Family MPU User Manual
UM005003-0703
Z8018x
13