Rainbow-electronics ATmega128RFA1 Manual de usuario Pagina 202

  • Descarga
  • Añadir a mis manuales
  • Imprimir
  • Pagina
    / 524
  • Tabla de contenidos
  • MARCADORES
  • Valorado. / 5. Basado en revisión del cliente
Vista de pagina 201
202
8266A-MCU Wireless-12/09
ATmega128RFA1
TOSC2, Timer Oscillator pin 1: Setting the AS2 bit to one and the EXCLKAMR bit to
zero in ASSR, enables asynchronous clocking of Timer/Counter2 by a Crystal
Oscillator. The pin PG4 is disconnected from the port, and becomes the input of the
inverting Oscillator amplifier. In this mode, a Crystal Oscillator is connected to this pin,
and the pin can not be used as an I/O pin.
TOSC2 – Port G, Bit 3
TOSC2, Timer Oscillator pin 2: Setting the AS2 bit to one and the EXCLKAMR bit to
zero in ASSR, enables asynchronous clocking of Timer/Counter2 by a Crystal
Oscillator. The pin PG3 is disconnected from the port, and becomes the inverting output
of the Oscillator amplifier. In this mode, a Crystal Oscillator is connected to this pin, and
the pin can not be used as an I/O pin.
AMR – Port G, Bit 2
AMR, Automated Meter Reading Input: Setting the AS2 and the EXCLKAMR bits in
ASSR to one, enables asynchronous clocking of Timer/Counter2 by the AMR pin
DIG1 – Port G, Bit 1
DIG1, Radio Transceiver Antenna Diversity Control Output: If the bit
ANT_EXT_SW_EN in ANT_DIV is set to one then the PG1 pin serves as a Radio
Transceiver output to control External Antenna Diversity.
DIG3 – Port G, Bit 0
DIG3, Radio Transceiver RX/TX Indicator Output: If the bit PA_EXT_EN in
TRX_CTRL_1 is set to one then the PG0 pin serves as the Radio Transceiver
receive/transmit indicator output to control an external RF front-end.
Table 14-16 below relates the alternate functions of Port G to the overriding signals
shown in Figure 14-5 on page 191.
Table 14-16. Overriding Signals for Alternate Functions PG5:PG2
Signal
Name
PG5/OC0B PG4/TOSC1 PG3/TOSC2 PG2/AMR
PUOE AS2 &
(~EXCLKAMR)
AS2 &
(~EXCLKAMR) &
(~EXCLK)
AS2 & EXCLKAMR
PUOV 0 0 0
DDOE AS2 &
(~EXCLKAMR)
AS2 &
(~EXCLKAMR) &
(~EXCLK)
AS2 & EXCLKAMR
DDOV 0 0 0
PVOE OC0B Enable 0 0 0
PVOV OC0B 0 0 0
DIEOE AS2 &
(~EXCLKAMR)
AS2 &
(~EXCLKAMR) &
(~EXCLK)
AS2 & EXCLKAMR
DIEOV EXCLK 0 1
DI AMR
AIO T/C2
OSC INPUT
T/C2
OSC OUTPUT
Vista de pagina 201
1 2 ... 197 198 199 200 201 202 203 204 205 206 207 ... 523 524

Comentarios a estos manuales

Sin comentarios