tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 305

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

RA000
19.3 Functions
through 7). After resetting, the
mode release pin, therefore, it is necessary to configure the key-on wakeup control register (KWUCRn) (n: 0 or 1).
Because the
release signal, irrespective of whether the key-on wakeup function is used or not.
By using the key-on wakeup function, the STOP mode can be released at a
Note 1: If an analog voltage is applied to KWIm pin for which receipt of inputs is enabled by the key-on wakeup control
• Setting KWUCRn and P4PU registers
• Starting STOP mode
• Releasing STOP mode
register (KWUCRn) setting, a penetration current will flow. Therefore, in this case, the analog voltage should be
not applied to this pin.
"1". After KWIm pin is set to "1" at KWUCRn<KWmEN>, a specific STOP mode release level can be
specified for this pin at KWUCRn<KWmLE>. If KWUCRn<KWmLE> is set to "0", STOP mode is
released when an input is at a low level. If it is set to "1", STOP mode is released when an input is at a
high level. For example, if you want to release STOP mode by inputting a high-level signal into a KWI0
pin, set KWUCR0<KW0EN> to "1", " and KWUCR0<KW0LE> to "1".
resistors, the corresponding bits in the pull-up control register (P4PU) at port P4 must be set to "1".
"1".
key-on wakeup function is used in edge release mode, STOP mode cannot be released, although a rising
edge is input into the
release level after the STOP mode starts.
the KWIm pin for which receipt of inputs is enabled. If you want to release STOP mode at the KWIm pin,
rather than the
from when the STOP mode is started to when it is released.
instruction will be executed without starting the STOP mode (with no warm-up performed).
Table 19-1 STOP Mode Release Level (edge)
STOP
To designate a key-on wakeup pin (KWIm) as a STOP mode release pin, set KWUCRn<KWmEN> to
Each KWIm pin can be connected to internal pull-up resistors. Before connecting to internal pull-up
To start the STOP mode, set SYSCR1<RELM> to "1" (level release mode), and SYSCR1<STOP> to
To use the key-on wakeup function, do not set SYSCR1<RELM> to "0" (edge release mode). If the
To release STOP mode, input a high-level signal into the
If the
Pin name
KWIm
STOP
pin lacks a function for disabling inputs, it can be designated as a pin for receiving a STOP mode
STOP
pin or KWIm pin is already at a release level when the STOP mode starts, the following
STOP
KWUCRn<KWmLE>="0"
STOP
pin, continue inputting a low-level signal into the
STOP
"L" level
pin is the only STOP mode release pin. To designate the KWIm pin as a STOP
pin. This is because the KWIm pin enabling inputs to be received is at a
SYSCR1<RELM>="1"
(level release mode)
"H" level
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KWUCRn<KWmLE>="1"
Release level (edge)
"H" level
STOP
pin or input a specific release level into
SYSCR1<RELM>="0"
(edge release mode)
Rising edge
STOP
Don't use
STOP
pin or at KWIm pin (m: 0
pin throughout the period
TMP89FM42