System Integration Unit (SIU)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
6-112
Freescale Semiconductor
6.3.1.158 Compare A Register High (SIU_CARH)
The compare registers are not intended for general application use, but are used temporarily by the BAM
during boot and intended optionally for communication with calibration tools. After reset, calibration tools
can immediately write a non-zero value to these registers. The application code, using the registers then as
read only, can read them to determine if a calibration tool is attached and operate appropriately.
The compare registers can be used just like 128 bits of memory mapped RAM that is always 0 out of reset,
or they can perform a 64-bit to 64-bit compare. The compare function is continuous (combinational logic
— not requiring a start or stop). The compare result appears in the MATCH bit in the SIU_CCR register.
The SIU_CARH holds the 32-bit value that is compared against the value in the SIU_CBRH register. The
CMPAH field is read/write and is reset by the synchronous reset signal.
Figure 6-154. Compare A Register High (SIU_CARH)
29
—
Reserved
30–31
EBDF
[0:1]
External bus division factor. Specifies the frequency ratio between the system clock and
the external clock, CLKOUT. Do not change EBDF during an external bus access or while
an access is pending. The CLKOUT frequency is divided from the system clock frequency
according to the descriptions below. When operating in dual controller mode (1:1), set the
divider to 0b01 (divide-by-2).
00
Invalid value
01
Divide by 2
10
Invalid value
11
Divide by 4
Address: Base + 0x0988
Access: R/W
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
CMPAH
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
CMPAH
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Table 6-137. SIU_ECCR Field Descriptions
Bits
Name
Description
Содержание MPC5565
Страница 18: ...MPC5565 Microcontroller Reference Manual Devices Supported MPC5565 MPC5565 RM Rev 1 0 09 2007...
Страница 34: ...MPC5565 Reference Manual Rev 1 0 Freescale Semiconductor 15...
Страница 35: ...MPC5565 Reference Manual Rev 1 0 16 Freescale Semiconductor...
Страница 325: ...Error Correction Status Module ECSM MPC5565 Microcontroller Reference Manual Rev 1 0 8 16 Freescale Semiconductor...
Страница 515: ...External Bus Interface EBI MPC5565 Microcontroller Reference Manual Rev 1 0 12 70 Freescale Semiconductor...
Страница 553: ...Flash Memory MPC5565 Microcontroller Reference Manual Rev 1 0 13 38 Freescale Semiconductor...
Страница 559: ...SRAM MPC5565 Microcontroller Reference Manual Rev 1 0 14 6 Freescale Semiconductor...
Страница 577: ...Boot Assist Module BAM MPC5565 Microcontroller Reference Manual Rev 1 0 15 18 Freescale Semiconductor...
Страница 895: ...Deserial Serial Peripheral Interface DSPI MPC5565 Microcontroller Reference Manual Rev 1 0 19 72 Freescale Semiconductor...
Страница 973: ...Preface MPC5565 Microcontroller Reference Manual Rev 1 0 21 36 Freescale Semiconductor...
Страница 1145: ...MPC5565 Register Map MPC5565 Microcontroller Reference Manual Rev 1 0 A 60 Freescale Semiconductor...
Страница 1153: ...Calibration MPC5565 Microcontroller Reference Manual Rev 1 0 B 8 Freescale Semiconductor...