Fujitsu MB91F109 FR30 Hardware Manual page 115

*: When STCR HIZX is "0", the previous state is held. Setting HIZX to "1" puts the pin to Hi-Z.
<Note>
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.
3.10 Standby Mode (Low Power Consumption Mechanism)
91