ATAM862P-TNSY4D Atmel, ATAM862P-TNSY4D Datasheet - Page 26

• Manufacturer Part Number: ATAM862P-TNSY4D
• Description: IC MCU FLASH 4K TX 433MHZ 24SSOP
• Manufacturer: Atmel

Specifications of ATAM862P-TNSY4D

• Applications: UHF ASK/FSK
• Core Processor: MARC4
• Program Memory Type: FLASH (4 kB)
• Controller Series: MARC4 4-Bit
• Ram Size: 256 x 4
• Interface: SSI
• Number Of I /o: 11
• Voltage - Supply: 1.8 V ~ 4 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 24-SSOP
• Processor Series: ATAM862x
• Core: MARC4
• Data Bus Width: 4 bit
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

19. Clock Generation
19.1
26
Clock Module
ATAM862-4
Figure 18-2. Internal Supply Voltage Supervisor
Figure 18-3. External Input Voltage Supervisor
The ATAM862-4 contains a clock module with 4 different internal oscillator types: two RC-oscil-
lators, one 4-MHz crystal oscillator and one 32-kHz crystal oscillator. The pins OSC1 and OSC2
are the interface to connect a crystal either to the 4-MHz, or to the 32-kHz crystal oscillator.
OSC1 can be used as input for external clocks or to connect an external trimming resistor for the
RC-oscillator 2. All necessary circuitry, except the crystal and the trimming resistor, is integrated
on-chip. One of these oscillator types or an external input clock can be selected to generate the
system clock (SYSCL).
In applications that do not require exact timing, it is possible to use the fully integrated RC-oscil-
lator 1 without any external components. The RC-oscillator 1 center frequency tolerance is
better than ± 50%. The RC-oscillator 2 is a trimmable oscillator whereby the oscillator frequency
can be trimmed with an external resistor attached between OSC1 and V
the RC-oscillator 2 frequency can be maintained stable with a tolerance of ± 15% over the full
operating temperature and voltage range.
The clock module is programmable via software with the clock management register (CM) and
the system configuration register (SC). The required oscillator configuration can be selected with
the OS1 bit and the OS0 bit in the SC register. A programmable 4-bit divider stage allows the
adjustment of the system clock speed. A special feature of the clock management is that an
external oscillator may be used and switched on and off via a port pin for the power-down mode.
Before the external clock is switched off, the internal RC-oscillator 1 must be selected with the
CCS bit and then the SLEEP mode may be activated.
3.0V
2.6V
2.2V
V
1.3V
VMI
DD
VMS = 1
Low threshold
Middle threshold
High threshold
Negative slope
Positive slope
VMS = 1
VMS = 0
Internal reference level
Interrupt positive slope
Interrupt negative slope
VMS = 1
VMS = 0
Low threshold
Middle threshold
High threshold
DD
. In this configuration,
VMS = 0
4551G–4BMCU–07/07
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