Datasheet

316
XMEGA B [DATASHEET]
8291B–AVR–01/2013
 Bits 1:0 – FCINTLVL[1:0]: Interrupt Level
This bit-field enables the LCD frame completed interrupt and selects the interrupt level as described in “Interrupts and
Programmable Multilevel Interrupt Controller” on page 121. The enabled interrupt will be triggered when the FCIF flag in
the INTFLAGS register is set.
25.5.5 INTFLAGS – Interrupt Flag register
 Bits 7:1 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always write these bits to zero
when this register is written.
 Bit 0 – FCIF: LCD Frames Completed Interrupt Flag
The generation of this flag depends on the XIME value in the INTCTRL register.
This bit is set by hardware at the beginning of a frame. FCIF is cleared by hardware when executing the corresponding
interrupt handling routine. Alternatively, writing a logical one to the flag clears FCIF.
25.5.6 CTRLD – Control register D
 Bits 7:4 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always write these bits to zero
when this register is written.
 Bit 3 – BLINKEN: Blink Enable
Writing this bit to one, the blink mode starts at the frequency specified by LCD blink rate (BLINKRATE). By writing it to
zero, the LCD blink module stops. This BLINKEN bit takes effect at the beginning of the next LCD frame. (For more
details see “Display Blinking” on page 309).
 Bit 2 – Reserved
This bit is unused and reserved for future use. For compatibility with future devices, always write this bit to zero when this
register is written.
 Bits 1:0 – BLINKRATE[1:0]: LCD Blink Rate
The BLINKRATE bit-field defines the frequency of the hardware Display Blinking when the BLINKEN bit is set. Blink
frequencies are shown in Table 25-10.
Table 25-10. Blink frequencies.
Bit 76543210
+0x04
– – – – – – – FCIF
Read/Write RRRRRRRR/W
Initial Value 0 0 0 0 0 0 0 0
Bit 76543210
+0x05
– – – – BLINKEN – BLINKRATE[1:0]
Read/Write RRRRR/WRR/WR/W
Initial Value 0 0 0 0 0 0 0 0
BLINKRATE[1:0] Blink frequency
00 4Hz
01 2Hz
10 1Hz
11 0.5Hz