Philips CEM2100/00 Service Manual page 141

Example 2 :Starting STOP mode from NORMAL mode with an INT5 interrupt.
PINT5: TEST
JRS
LD
DI
SET
SINT5: RETI
STOP pin
XOUT pin
NORMAL
operation
Figure 2-7 Level-sensitive Release Mode
Note 1: Even if the
Note 2: In this case of changing to the level-sensitive mode from the edge-sensitive mode, the release
mode is not switched until a rising edge of the
(2) Edge-sensitive release mode (RELM = "0")
In this mode, STOP mode is released by a rising edge of the
cations where a relatively short program is executed repeatedly at periodic intervals. This periodic
signal (for example, a clock from a low-power consumption oscillator) is input to the
the edge-sensitive release mode, STOP mode is started even when the
Do not use any STOP3 to STOP0 pin input for releasing STOP mode in edge-sensitive release mode.
Example :Starting STOP mode from NORMAL mode
DI
LD
STOP pin
XOUT pin
NORMAL
operation
STOP mode started
by the program.
Figure 2-8 Edge-sensitive Release Mode
(P2PRD). 0 ; To reject noise, STOP mode does not start if
F, SINT5 port P20 is at high
(SYSCR1), 01010000B ; Sets up the level-sensitive release mode.
; IMF ← 0
(SYSCR1). 7 ; Starts STOP mode
STOP
operation
Confirm by program that the
STOP pin input is low and start
STOP mode.
pin input is low after warm-up start, the STOP mode is not restarted.
STOP
; IMF ← 0
(SYSCR1), 10010000B ; Starts after specified to the edge-sensitive release mode
V
IH
STOP
Warm up
operation
Page 19
V
IH
Warm up
STOP mode is released by the hardware.
Always released if the STOP
pin input is high.
pin input is detected.
STOP
pin input. This is used in appli-
STOP
STOP
NORMAL
operation
STOP mode is released by the hardware at the rising
edge of STOP pin input.
T5CL8
NORMAL
operation
pin. In
STOP
pin input is high level.
STOP
operation