Rev. 2.00, 09/03, page 554 of 690
22.2.12
Branch Destination Register (BRDR)
BRDR is a 32-bit read-only register. BRDR stores bits 27 to 0 in the address of the branch
destination instruction. BRDR has the flag bit that is set to 1 when a branch occurs. This flag bit is
cleared to 0 when BRDR is read, the setting to enable PC trace is made, or BRDR is initialized by
a power-on reset. Other bits are not initialized by a power-on reset. The eight BRDR registers have
a queue structure and a stored register is shifted at every branch.
Bit
Bit
Name
Initial
Value
R/W
Description
31
DVF
0
R
BRDR Valid Flag
Indicates whether a branch destination address is
stored. When a branch destination address is
fetched, this flag is set to 1. This flag is cleared to 0
by reading BRDR.
0: The value of BRDR register is invalid
1: The value of BRDR register is valid
30 to
28
0
R
Reserved
These bits are always read as 0.
27 to 0
BDA27 to
BDA0
Undefined
R
Branch Destination Address
Store bits 27 to 0 of the branch destination address.
22.2.13
Break ASID Register A (BASRA)
BASRA is an 8-bit readable/writable register that specifies ASID which becomes the break
condition for channel A. BASRA is in CCN.
Bit
Bit
Name
Initial
Value
R/W
Description
7 to 0
BASA7
to
BASA0
R/W
Break ASID A
Store ASID (bits 7 to 0) which is the break condition
for channel A.
Содержание SH7705
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