EVAL-ADUC7128QSPZ Analog Devices Inc, EVAL-ADUC7128QSPZ Datasheet - Page 77

• Manufacturer Part Number: EVAL-ADUC7128QSPZ
• Description: KIT DEV FOR ADUC7128
• Manufacturer: Analog Devices Inc
• Series: QuickStart™ PLUS Kitr
• Type: MCUr

Specifications of EVAL-ADUC7128QSPZ

• Contents: Evaluation Board, Power Supply, Cable, Software, Emulator and Documentation
• Silicon Manufacturer: Analog Devices
• Core Architecture: ARM
• Core Sub-architecture: ARM7TDMI
• Silicon Core Number: ADuC7128
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: ADuC7128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

TIMER2—WAKE-UP TIMER
EXTERNAL 32kHz
Timer2 is a 32-bit wake-up timer, count down or count up, with
a programmable prescaler. The prescaler is clocked directly from
one of four clock sources, namely, the core clock (default selection),
the internal 32.768 kHz oscillator, the external 32.768 kHz watch
crystal, or the core clock. The selected clock source can be
scaled by a factor of 1, 16, 256, or 32768. The wake-up timer
continues to run when the core clock is disabled. This gives
a minimum resolution of 22 ns when the core is operating at
41.78 MHz and with a prescaler of 1. Capture of the current
timer value is enabled if the Timer2 interrupt is enabled via
IRQEN[4].
The counter can be formatted as plain 32-bit value or as
hours:minutes:seconds:hundredths.
Timer2 reloads the value from T2LD either when Timer2
overflows or immediately after T2ICLR is written.
The Timer2 interface consists of four MMRs, as shown in
Table 112.
Table 112. Timer2 Interface MMRs
Name
T2LD
T2VAL
T2ICLR
T2CON
INTERNAL 32kHz
CORE CLOCK
OSCILLATOR
OSCILLATOR
Description
A 32-bit register. Holds 32-bit unsigned integers.
A 32-bit register. Holds 32-bit unsigned integers.
This register is read only.
An 8-bit register. Writing any value to this register
clears the Timer2 interrupt.
The configuration MMR (see Table 113).
Figure 57. Timer2 Block Diagram
PRESCALER
1, 16, 256,
OR 32768
COUNTER
UP/DOWN
TIMER2
VALUE
32-BIT
32-BIT
LOAD
TIMER2IRQ
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Timer2 Load Register
Name
T2LD
T2LD is a 32-bit register that holds the 32 bit value that is loaded
into the counter.
Timer2 Clear Register
Name
T2ICLR
This 8-bit write-only MMR is written (with any value) by user
code to refresh (reload) Timer2.
Timer2 Value Register
Name
T2VAL
T2VAL is a 32-bit register that holds the current value of Timer2.
Timer2 Control Register
Name
T2CON
This 32-bit MMR configures the mode of operation for Timer2.
Address
0xFFFF0340
Address
0xFFFF034C
Address
0xFFFF0344
Address
0xFFFF0348
ADuC7128/ADuC7129
Default Value
0x00000
Default Value
0x00
Default Value
0x0000
Default Value
0x0000
Access
R/W
Access
W
Access
R
Access
R/W