aduc7030 Analog Devices, Inc., aduc7030 Datasheet - Page 88

• Manufacturer Part Number: aduc7030
• Description: Integrated Precision Battery Sensor For Automotive
• Manufacturer: Analog Devices, Inc.

Preliminary Technical Data
TIMER2 - WAKE-UP TIMER
Timer2 is a 32-bit wake-up timer, count-down or count-up,
with a programmable prescalar. The pre-scalar is clocked
directly from 1 of 4 clock sources, namely, the Core Clock
(default selection), the Low Power 32.768kHz Oscillator,
External 32.768kHz Watch Crystal, or the Precision 32.768kHz
Oscillator. The selected clock source can be scaled by a factor of
1, 16, 256 or 32768. The wake-up timer will continue to run
when the core clock is disabled. This gives a minimum
resolution of 48.83ns when operating at CD zero, the core is
operating at 20.48MHz, and with a prescalar of 1.
The counter can be formatted as plain 32-bit value or as
Hours:Minutes:Seconds:Hundreths.
Timer2 reloads the value from T2LD either when Timer2
overflows, or immediately when T2CLRI is written.
Timer2 interface consists of four MMRS:
- T2LD and T2VAL are 32-bit registers and hold 32-bit
unsigned integers. T2VAL is read-only.
- T2CLRI is an 8-bit register. Writing any value to this register
will clear the timer2 interrupt.
- T2CON is the configuration MMR described in Table 36
below.
32.768kHz OSCILLATOR
32.768kHz OSCILLATOR
EXTERNAL 32.768kHz
WATCH CRYSTAL
LOW POWER
PRECISION
CLOCK
CORE
Figure 32. Timer 2 Block Diagram
Rev. PrE | Page 88 of 150
1, 16, 256, OR 32768
PRESCALER
Timer2 Load Registers:
Name:
Address:
Default
Value:
Access:
Function:
Timer2 Clear Register:
Name:
Address:
Access:
Function:
Timer2 Value Register:
Name:
Address:
Default
Value:
Access:
Function:
UP/DOWN COUNTER
32-BIT LOAD
TIMER2
VALUE
32-BIT
T2LD
0xFFFF0340
0x00000000
Read/Write
T2LD is a 32-bit register, which holds the 32 bit
value that is loaded into the counter.
T2CLRI
0xFFFF034C
Write Only
This 32-bit, write-only MMR is written (with any
value) by user code to refresh (reload) Timer2.
T2VAL
0xFFFF0344
0xFFFFFFFF
Read Only
T2VAL is a 32-bit register which holds the current
value of Timer2.
TIMER2 IRQ
ADuC7030/ADuC7033