Control whether debugger, DMA, core 0 and core 1 can access TIMER0, and at what security/privilege levels they can do so. Defaults to Secure access from any master. This register is writable only from a Secure, Privileged processor or debugger, with the exception of the NSU bit, which becomes Non-secure-Privileged-writable when the NSP bit is set.
Write 1 to reset all ACCESSCTRL configuration, except for the LOCK and FORCE_CORE_NS registers. This bit is used in the RP2350 bootrom to quickly restore ACCESSCTRL to a known state during the boot path. Note that, like all registers in ACCESSCTRL, this register is not writable when the writer’s corresponding LOCK bit is set, therefore a master which has been locked out of ACCESSCTRL can not use the CFGRESET register to disturb its contents.
Force core 1’s bus accesses to always be Non-secure, no matter the core’s internal state. Useful for schemes where one core is designated as the Non-secure core, since some peripherals may filter individual registers internally based on security state but not on master ID.
Control whether GPIO32..47 are accessible to Non-secure code, and whether QSPI and USB bitbang are accessible through the Non-secure SIO. Writable only by a Secure, Privileged processor or debugger.
Once a LOCK bit is written to 1, ACCESSCTRL silently ignores writes from that master. LOCK is writable only by a Secure, Privileged processor or debugger. LOCK bits are only writable when their value is zero. Once set, they can never be cleared, except by a full reset of ACCESSCTRL Setting the LOCK bit does not affect whether an access raises a bus error. Unprivileged writes, or writes from the DMA, will continue to raise bus errors. All other accesses will continue not to.