t6020m ATMEL Corporation, t6020m Datasheet - Page 25

• Manufacturer Part Number: t6020m
• Description: Low-current Microcontroller For Watchdog Function
• Manufacturer: ATMEL Corporation

3.3
The Universal Timer/counter/ Communication Module
(UTCM) consists of Timer 1, Timer 2 and a Synchronous
Serial Interface (SSI).
D Timer 1 is an interval timer that can be used to
D Timer 2 is an 8/12-bit timer with an external clock in-
Rev. A3, 02-Apr-01
3 2 1 0
x x 1 1 BP40 in input mode
x x 1 0 BP40 in output mode
x x 0 1 BP40 enable alternate function (SC for SSI)
x x 0 0 BP40 enable alternate function (falling
1 1 x x BP41 in intput mode
1 0 x x BP41 in output mode
0 1 x x BP41 enable alternate function (VMI for
0 0 x x BP41 enable alternate function (T2I exter-
Code
Auxiliary Address: ’4’hex
generate periodical interrupts and as prescaler for
Timer 2, the serial interface and the watchdog func-
tion.
Universal Timer/Counter / Communication Module (UTCM)
edge interrupt input for INT3)
voltage monitor input)
nal clock input for Timer 2)
T2I
SYSCL
SUBCL
T1OUT
Function
POUT
TOG2
First Write Cycle
from clock module
MUX
MUX
MUX DCG
MUX
Figure 23. UTCM block diagram
Receive–Buffer
8-bit Shift–Register
Transmit–Buffer
4-bit Counter 2/1
Compare 2/1
8-bit Counter 2/2
Compare 2/2
Timer 1
Interval / Prescaler
Timer 2
Control
SSI
3 2 1 0
x x 1 1
x x 1 0
x x 0 x
1 1 x x
1 0 x x
0 1 x x
0 0 x x
Code
D The SSI operates as two wire serial interface or as shift
There is a multitude of modes in which the timers and the
serial interface can work together.
–––
Watchdog
put (T2I) and an output (T2O).
register for modulation. The modulator units work
together with the timers and shift the data bits out of
the shift register.
BP42 in input mode
BP42 in output mode
BP42 enable alternate function (T2O for
Timer 2)
BP43 in input mode
BP43 in output mode
BP43 enable alternate function (SD for SSI)
BP43 enable alternate function (falling
edge interrupt input for INT3)
–––
Control
Modu–
lator 2
SCL
Second Write Cycle
I/O bus
Function
NRST
INT2
INT4
INT3
T6020M
13393
T2O
SC
SD
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