TMP86C820UG Datasheet, PDF (130/160 Pages) Toshiba Semiconductor – 8 Bit Microcontroller

12. Key-on Wakeup (KWU)
12.3 Function
TMP86C820UG
Also, each level of the STOP2 to STOP5 pins can be confirmed by reading corresponding I/O port data register,
check all STOP2 to STOP5 pins "H" that is enabled by STOPCR before the STOP mode is started (Note2,3).
Note 1: When the STOP mode released by the edge release mode (SYSCR1<RELM> = “0”), inhibit input from STOP2 to
STOP5 pins by Key-on Wakeup Control Register (STOPCR) or must be set "H" level into STOP2 to STOP5 pins
that are available input during STOP mode.
Note 2: When the STOP pin input is high or STOP2 to STOP5 pins input which is enabled by STOPCR is low, executing an
instruction which starts STOP mode will not place in STOP mode but instead will immediately start the release
sequence (Warm up).
Note 3: The input circuit of Key-on Wakeup input and Port input is separated, so each input voltage threshold value is dif-
ferent. Therefore, a value comes from port input before STOP mode start may be different from a value which is
detected by Key-on Wakeup input (Figure 12-2).
Note 4: STOP pin doesn’t have the control register such as STOPCR, so when STOP mode is released by STOP2 to
STOP5 pins, STOP pin also should be used as STOP mode release function.
Note 5: In STOP mode, Key-on Wakeup pin which is enabled as input mode (for releasing STOP mode) by Key-on
Wakeup Control Register (STOPCR) may generate the penetration current, so the said pin must be disabled AD
conversion input (analog voltage input).
Note 6: When the STOP mode is released by STOP2 to STOP5 pins, the level of STOP pin should hold "L" level (Figure
12-3).
Port input
External pin
Key-on wakeup
input
Figure 12-2 Key-on Wakeup Input and Port Input
a) STOP
b) In case of STOP2 to STOP5
STOP pin
STOP mode
Release
STOP mode
STOP pin "L"
STOP2 pin
STOP mode
Release
STOP mode
Figure 12-3 Priority of STOP pin and STOP2 to STOP5 pins
Table 12-1 Release level (edge) of STOP mode
Pin name
STOP
STOP2
STOP3
STOP4
STOP5
Release level (edge)
SYSCR1<RELM>="1"
(Note2)
SYSCR1<RELM>="0"
"H" level
Rising edge
"L" level
Don’t use (Note1)
"L" level
Don’t use (Note1)
"L" level
Don’t use (Note1)
"L" level
Don’t use (Note1)
Page 118