mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 285

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

System Interface Unit
TBREFL—Timebase Reference Lower
These bits represent the 32-bit reference value for the lower part of the timebase.
12.6.3 Timebase Status and Control Register
The 16-bit read/write timebase status and control register (TBSCR) controls the timebase
count enable and interrupt generation. It is also is used for reporting the source of the
interrupts and can be read at any time. A status bit is cleared by writing a 1 (writing a zero
has no effect) and more than one bit can be cleared at a time.
TBIRQ—Timebase Interrupt Request
This field determines the interrupt priority level of the timebase. To specify a certain level,
the appropriate bit must be set.
REFA and REFB—Reference Interrupt Status
If set, these bits indicate that a match has been detected between the corresponding
reference register (TBREFU for REFA and TBREFL for REFB) and the timebase low
register. Each bit must be cleared by writing a 1.
TBREFL
TBSCR
NOTE: — = Undefined.
RESET
RESET
RESET
FIELD
ADDR
FIELD
ADDR
FIELD
ADDR
R/W
R/W
R/W
BIT
BIT
BIT
16
0
0
17
1
1
18
2
2
Freescale Semiconductor, Inc.
For More Information On This Product,
19
3
3
TBIRQ
R/W
0
20
MPC823 REFERENCE MANUAL
4
4
Go to: www.freescale.com
21
5
5
(IMMR & 0xFFFF0000) + 0x20A
(IMMR & 0xFFFF0000) + 0x208
22
6
6
(IMMR & 0xFFFF0000) + 0x200
23
7
TBREFL
TBREFL
7
R/W
R/W
—
—
REFA
R/W
24
8
8
0
REFB
R/W
25
9
9
0
10
26
10
RESERVED
R/W
0
11
27
11
REFAE
R/W
12
28
12
0
REFBE
R/W
13
29
13
0
MOTOROLA
TBF
R/W
14
30
14
0
TBE
R/W
15
31
15
0