8.2.6.9 TZAESB Extended Mode Register

This register can only be written if WPEN is cleared in the TZAESB Write Protection Mode Register.

Name: TZAESB_EMR
Offset: 0xB0
Reset: 0x00000000
Property: Read/Write

Bit 3130292827262524 
          
Access  
Reset  
Bit 2322212019181716 
          
Access  
Reset  
Bit 15141312111098 
          
Access  
Reset  
Bit 76543210 
 PKRSPKWO       
Access R/WR/W 
Reset 00 

Bit 7 – PKRS Private Key Internal Register Select

ValueDescription
0

The key used by the TZAESB is in the TZAESB_KEYWRx.
1

The key used by the TZAESB is in the Private Key internal register written through the Private Key bus.

Bit 6 – PKWO Private Key Write Once

Once PKWO is set to '1', only a hardware reset sets this bit to ‘0’ internally. Writing it to '0' with a register access has no impact (although the field will be read to value '0').
ValueDescription
0

The Private Key internal register can be written multiple times through the Private Key bus.
1

The Private Key internal register can be written only once through the Private Key bus until hardware reset.