tmp88cu74 TOSHIBA Semiconductor CORPORATION, tmp88cu74 Datasheet - Page 15

• Manufacturer Part Number: tmp88cu74
• Description: Cmos 8-bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

1.4.4
Operating Mode Control
(1) STOP mode (STOP1, STOP2)
pin input. The
interrupt input 5) pin. STOP mode is started by setting STOP (bit 7 in SYSCR1) to “1”.
During STOP mode, the following status is maintained.
1.
2.
3.
4.
a.
1.
2.
STOP mode is controlled by the system control register 1 (SYSCR1) and the
Oscillations are turned off, and all internal operations are halted.
all held in the status in effect before STOP mode was entered.
The prescaler and the divider of the timing generator are cleared to “0”.
The program counter holds the address of the instruction but one to the
instruction (e.g.[SET (SYSCR1).7]) which started STOP mode.
release mode, either of which can be selected with the RELM (bit 6 in SYSCR1).
Level-sensitive release mode (RELM = “1”)
is used for capacitor back-up when the main power supply is cut off and long term
battery back-up.
mode will not place in STOP mode but instead will immediately start the release
sequence (warm-up). Thus, to start STOP mode in the level-sensitive release mode,
it is necessary for the program to first confirm that the
following two methods can be used for confirmation.
Testing a port P20.
Using an external interrupt input
The data memory, registers, the program status word and port output latches are
Example 1: Starting STOP mode from NORMAL mode by testing a port P20.
SSTOPH:
Example 2: Starting STOP mode from NORMAL mode with an INT5 interrupt.
PINT5:
SINT5:
STOP mode includes a level-sensitive release mode and an edge-sensitive
In this mode, STOP mode is released by setting the
When the
STOP
STOP
LD
TEST
JRS
SET
TEST
JRS
LD
SET
RETI
pin is also used both as a port P20 and an INT5 (external
pin input is high, executing an instruction which starts STOP
(SYSCR1), 01010000B
(P2). 0
F, SSTOPH
(SYSCR1). 7
(P2). 0
F, SINT5
(SYSCR1), 01010000B
(SYSCR1). 7
88CU74-15
INT5
(
INT5
;
;
;
;
;
;
is a falling edge-sensitive input).
Sets up the level-sensitive release mode
Wait until the
level
Starts STOP mode
To reject noise, STOP mode does not
start if port P20 is at high
Sets up the level-sensitive release mode.
Starts STOP mode
STOP
STOP
STOP
pin input is low. The
pin high. This mode
pin input goes low
TMP88CU74
2007-10-19
2003-02-17
STOP