159
Clock Generator
Chapter 4
Preliminary User’s Manual U17566EE1V2UM00
(2)
PSC - Power save control register
The 8-bit PSC register is used to enter or leave the power save mode specified
in register PSM.
Access
This register can be read/written in 8-bit or 1-bit units.
Writing to this register is protected by a special sequence of instructions.
Please refer to
“PRCMD - PSC write protection register” on page 160
for
details.
Address
FFFF F1FE
H
.
Initial Value
00
H
. The register is cleared by any reset.
Note
1.
If bits 7, 3, 2, and 0 are not set to 0, proper operation of the controller can
not be guaranteed.
2.
PSC.STP is automatically cleared when the controller is awakened from
power save mode.
3.
Entering a power save mode requires some attention, refer to
“Power save
mode activation” on page 179
.
7
6
5
4
3
2
1
0
0
NMIWDT
NMI0
INTM
0
0
STP
0
R
R/W
R/W
R/W
R
R
R/W
R
Table 4-19
PSC register contents
Bit position
Bit name
Function
6
NMIWDT
Mask for non-maskable interrupt request from WDT:
0: Permit NMIWDT request during power save mode.
1: Prohibit NMIWDT request during power save mode.
5
NMI0
Mask for non-maskable interrupt request 0:
0: Permit external NMI0 request during power save mode
1: Prohibit external NMI0 request during power save mode.
4
INTM
Mask for maskable interrupt request:
0: Permit maskable interrupt requests during power save mode.
a
1: Prohibit maskable interrupt requests during power save mode.
a)
Only dedicated maskable interrupts have wake-up capability, refer to
“Power save modes description” on
page 167
.
1
STP
Enter/release power save mode:
0: Power save mode is released.
1: Power save mode is entered.
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