
MOTOROLA
Chapter 5. Unified System Interface Unit (USIU)
5-7
USIU Module Overview
5.1.2
USIU Special-Purpose Registers
Table 5-2 lists the MPC565/MPC566 special purpose registers (SPR). These registers
reside in an alternate internal memory space that can only be accessed with the mtspr and
Modes,” for details). All registers are 32 bits wide.
NOTE
RCPU special purpose registers can not be accessed by
external master. Only SPR’s in the USIU can be accessed by an
external master.
Clocks and Reset Keys
0x2F C380
System Clock Control Key (SCCRK)
0x2F C384
PLL Low-Power and Reset Control Register Key (PLPRCRK)
0x2F C388
Reset Status Register Key (RSRK)
0x2F C38C–0x2F C3FC Reserved
1 16-bit register.
Table 5-2. USIU Special-Purpose Registers
Internal
Address[0:31]
Register
Decimal Address
spr[5:9]:spr[0:4] 1
1 Bits [0:17] and [28:31] are all 0.
0x2C00
Decrementer (DEC).
for more information.
22
0x1880
Time Base — Read (TB).
268
0x1A80
Time Base Upper — Read (TBU).
descriptions
269
0x3880
Time Base — Write (TB).
284
0x3A80
Time Base Upper — Write (TBU).
descriptions
285
0x3D30
Internal Memory Mapping Register (IMMR).
638
Table 5-1. Address Map (continued)
Address
Register