ADUC7122 Analog Devices, ADUC7122 Datasheet - Page 87

• Manufacturer Part Number: ADUC7122
• Description: Precision Analog Microcontroller, 12-Bit Analog I/O, ARM7TDMI® MCU
• Manufacturer: Analog Devices

Specifications of ADUC7122

• Mcu Core: ARM7 TDMI
• Mcu Speed (mips): 40
• Sram (bytes): 8192Bytes
• Gpio Pins: 32
• Adc # Channels: 13

TIMER2—WAKE-UP TIMER
Timer2 is a 32-bit wake-up timer, count down or count up, with
a programmable prescaler. The prescaler is clocked directly from 1
of 4 clock sources, including the core clock (default selection),
the internal 32.768 kHz oscillator, the external 32.768 kHz
watch crystal, or the PLL undivided clock. The selected clock
source can be scaled by a factor of 1, 16, 256, or 32,768. 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] (see Table 128).
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 when T2ICLR is written.
The Timer2 interface consists of four MMRs, shown in
Table 157.
Table 157. Timer2 Interface Registers
Register
T2LD
T2VAL
T2CLRI
T2CON
Description
32-bit register. Holds 32-bit unsigned integers.
32-bit register. Holds 32-bit unsigned integers. This
register is read only.
8-bit register. Writing any value to this register clears
the Timer2 interrupt.
Configuration MMR.
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Table 158. Timer2 Load Registers
Name
T2LD
T2LD is a 32-bit register, which holds the 32-bit value that is
loaded into the counter.
Table 159. Timer2 Clear Register
Name
T2CLRI
This 8-bit write-only MMR is written (with any value) by user
code to refresh (reload) Timer2.
Table 160. Timer2 Value Register
Name
T2VAL
T2VAL is a 32-bit register that holds the current value of Timer2.
Table 161. Timer2 Control Register
Name
T2CON
This 32-bit MMR configures the mode of operation for Timer2.
Address
0xFFFF0340
Address
0xFFFF034C
Address
0xFFFF0344
Address
0xFFFF0348
Default Value
0x00000
Default Value
0x00
Default Value
0x0000
Default Value
0x0000
ADuC7122
Access
R/W
Access
W
Access
R
Access
R/W