For those looking for more technical information for the Cortex-M33 the TRM is now posted in info center
http://infocenter.arm.com/help/topic/com.arm.doc.100230_0002_00_en/cortex_m33_trm_100230_0002_00_en.pdf
The Cortex-M23 TRM was posted a while back
http://infocenter.arm.com/help/topic/com.arm.doc.ddi0550c/cortex_m23_r1p0_technical_reference_manual_DDI0550C_en.pdf