Z8S180 Zilog., Z8S180 Datasheet - Page 51

• Manufacturer Part Number: Z8S180
• Description: ENHANCED Z180 MICROPROCESSOR
• Manufacturer: Zilog.

36
UM005001-ZMP0400
Z 8018x Fam il y
M PU Us e r M anual
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.