Key-On Wakeup (Kwu); Configuration; Control; Function - Philips CEM2100/00 Service Manual

18. Key-on Wakeup (KWU)

In the T5CL8
STOP3) pins.
When the STOP mode is released by STOP0 to STOP3 pins, the
In details, refer to the following section " 18.2 Control ".

18.1 Configuration

STOP mode
release signal
(1: Release)

18.2 Control

STOP0 to STOP3 pins can controlled by Key-on Wakeup Control Register (STOPCR). It can be configured as
enable/disable in 1-bit unit. When those pins are used for STOP mode release, configure corresponding I/O pins to
input mode by I/O port register beforehand.
Key-on Wakeup Control Register
STOPCR 7
(0F9FH) STOP3 STOP2
STOP3 STOP mode released by STOP3
STOP2 STOP mode released by STOP2
STOP1 STOP mode released by STOP1
STOP0 STOP mode released by STOP0

18.3 Function

Stop mode can be entered by setting up the System Control Register (SYSCR1), and can be exited by detecting the
"L" level on STOP0 to STOP3 pins, which are enabled by STOPCR, for releasing STOP mode (Note1).
, the STOP mode is released by not only P20(
INT5
STOPCR
(0F9FH)
Figure 18-1 Key-on Wakeup Circuit
6 5 4 3
STOP1 STOP0
Page 221
/ ) pin but also four (STOP0 to
INT5 STOP
pin needs to be used.
STOP
2 1 0
(Initial value: 0000 ****)
0:Disable
1:Enable
0:Disable
1:Enable
0:Disable
1:Enable
0:Disable
1:Enable
T5CL8
STOP
STOP0
STOP1
STOP2
STOP3
Write
only
Write
only
Write
only
Write
only