z80189 ZiLOG Semiconductor, z80189 Datasheet - Page 51

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

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UM005003-0703
Z8018x
Family MPU User Manual
Low Power Modes (Z8S180/Z8L180 only)
Add-On Features
The following section is a detailed description of the enhancements to the
Z8S180/L180 from the standard Z80180 in the areas of STANDBY, IDLE
and STANDBY QUICK RECOVERY modes.
There are five different power-down modes. SLEEP and SYSTEM STOP
are inherited from the Z80180. In SLEEP mode, the CPU is in a stopped
state while the on-chip I/Os are still operating. In I/O STOP mode, the on-
chip I/Os are in a stopped state while leaving the CPU running. In
SYSTEM STOP mode, both the CPU and the on-chip I/Os are in the
stopped state to reduce current consumption. The Z8S180 features two
additional power-down modes, STANDBY and IDLE, to reduce current
consumption even further. The differences in these power-down modes
are summarized in Table 5.