Sharp LH79524 - Register Definitions; Table 3-8. PBC Register; Table 3-9. PBC Fields

Boot Controller LH79524/LH79525 User’s Guide
3-8 Version 1.0
3.2.2 Register Definitions
3.2.2.1 Power-up Boot Configuration Register (PBC)
Reading from the PBC register returns the value that the PC[7:4] pins were driven during
a power-on reset. This value is used by software contained in the Boot ROM, as well as
the Boot Controller, to determine the type and configuration of the external device from
which the CPU is to boot.
Table 3-8. PBC Register
BIT 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
FIELD ///
RESET 0000000000000000
RW RO RO RO RO RO RO RO RO RO RO RO RO RO RO RO RO
BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
FIELD /// PBC
RESET 000000000000 PC[7:4]
RW RO RO RO RO RO RO RO RO RO RO RO RO RO RO RO RO
ADDR 0xFFFE6000 + 0x00
Table 3-9. PBC Fields
BITS NAME DESCRIPTION
31:4 /// Reserved Reading returns 0. Write the reset value.
3:0 PBC
Power-up Boot Configuration This field contains the value that the PC[7:4]
pins were driven during power-on reset.