Datasheet

Section 21 Power-Down Modes
Rev.6.00 Sep. 27, 2007 Page 922 of 1268
REJ09B0220-0600
Bit 6
STS2
Bit 5
STS1
Bit 4
STS0 Description
0 0 0 Standby time = 8192 states (Initial value)
1 Standby time = 16384 states
1 0 Standby time = 32768 states
1 Standby time = 65536 states
1 0 0 Standby time = 131072 states
1 Standby time = 262144 states
1 0 Reserved
1 Standby time = 16 states
*
Note: * Not available in the F-ZTAT versions.
Bit 3—Output Port Enable (OPE): Specifies whether the output of the address bus and bus
control signals (CS0 to CS7, AS, RD, HWR, LWR, CAS) is retained or set to the high-impedance
state in software standby mode.
Bit 3
OPE Description
0 In software standby mode, address bus and bus control signals are high-impedance
1 In software standby mode, address bus and bus control signals retain output state
(Initial value)
Bits 2 and 1—Reserved: These bits cannot be modified and are always read as 0.
Bit 0—IRQ37 Software Standby Clear Select (IRQ37S): Specifies whether inputs IRQ3 to
IRQ7 can be used as software standby mode clearing sources in addition to the usual sources, NMI
and IRQ0 to IRQ2 inputs.
Bit 0
IRQ37S Description
0 Inputs IRQ3 to IRQ7 cannot be used as software standby mode clearing sources
(Initial value)
1 Inputs IRQ3 to IRQ7 can be used as software standby mode clearing sources