FUJITSU MB91F109 FR30 - Manual (Page 115)

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3.10 Standby Mode (Low Power Consumption Mechanism)
*: When STCR HIZX is "0", the previous state is held. Setting HIZX to "1" puts the pin to Hi-Z.
Reset: RSTX = "0"
SRST bit of STCR register = "0"
Watchdog timer reset
Power-on reset
■ Mapping Addresses of Programs Used to Put Systems into Stop or Sleep State
Place programs which are used to put clock systems into stop or sleep state into C-bus ROM or
external memory address areas.
Do not place them in C-bus RAM.