tmp19a44fda TOSHIBA Semiconductor CORPORATION, tmp19a44fda Datasheet - Page 504

• Manufacturer Part Number: tmp19a44fda
• Description: 32bit Tx System Risc
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Key-on Wakeup Circuit
20.4 Key Input Detection Timing
Key input
Interrupt detection timing
Internal sampling results
1)
2)
When the static pull-up is selected by setting PnPE<PEn> to 1 and KWUPSTn<DPEn> to 0:
The active state of each key input can be defined to the high or low level or to the rising and/or
falling edges by setting KWUPSTn<KEYn2:0>. The active states of key inputs are continuously
detected.
When the dynamic pull-up is selected by setting PnPE<PEn> to 1 and KWUPSTn<DPEn> to 1:
Detection of the active state of each key input (interrupt detection) is carried out only at the edge
one-clock before fs at the end of the T1 period. Therefore, a key input not shorter than the T2
period is needed. In this case, do not define the active state to the high or low level. There is a
delay up to the T2 period before key input detection. The figure below shows an example of
defining the active state to the falling edge.
H or High-Z
Pull-up(T1)
TMP19A44(rev1.3)20-4
T2 period or longer is required (L period)
(T2)
TMP19A44
Key input detection
H or High-Z or L
2010-04-01