Datasheet

Data Sheet ADuC7060/ADuC7061
Rev. D | Page 69 of 108
Bit Name Description
5:4 T0FORMAT Format.
[00] = binary (default).
[01] = reserved.
[10] = hours:minutes:seconds:hundredths (23 hours to 0 hours).
[11] = hours:minutes:seconds:hundredths (255 hours to 0 hours).
3:0 T0SCALE Prescaler.
[0000] = source clock/1 (default).
[0100] = source clock/16.
[1000] = source clock/256.
[1111] = source clock/32,768. Note that all other values are undefined.
TIMER1 OR WAKE-UP TIMER
Timer1 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 (which is the
default selection), external 32.768 kHz watch crystal, or the
32.768 kHz oscillator. 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 97.66 ns when operating at CD zero, the
core is operating at 10.24 MHz, and with a prescaler of 1
(ignoring the external GPIOs).
The counter can be formatted as a plain 32-bit value or as
hours:minutes:seconds:hundredths.
Timer1 reloads the value from T1LD either when Timer1
overflows or immediately when T1LD is written.
The Timer1 interface consists of four MMRS.
• T1LD and T1VAL are 32-bit registers and hold 32-bit,
unsigned integers. T1VAL is read only.
• T1CLRI is an 8-bit register. Writing any value to this
register clears the Timer1 interrupt.
• T1CON is the configuration MMR, described in Table 81.
Timer1 Load Registers
Name: T1LD
Address: 0xFFFF0340
Default value: 0x00000000
Access: Read and write
Function: T1LD is a 32-bit register that holds the 32-bit
value that is loaded into the counter.
Timer1 Clear Register
Name: T1CLRI
Address: 0xFFFF034C
Access: Write only
Function: This 8-bit, write-only MMR is written (with
any value) by user code to clear the interrupt.
Timer1 Value Register
Name: T1VA L
Address: 0xFFFF0344
Default value: 0xFFFFFFFF
Access: Read only
Function: T1VAL is a 32-bit register that holds the
current value of Timer1.