Intel STRONGARM SA-1100 - Manual (Page 198)

11-48 SA-1100 Developer’s Manual
Peripheral Control Module
11.7.11.10 Output FIFO Underrun Lower Panel Status (OUL) (read/write,
maskable interrupt)
The output FIFO underrun lower panel status (OUL) bit is set when the lower panel’s output FIFO
is completely empty and the LCD’s data pin driver logic attempts to fetch data from the FIFO. It is
cleared by writing a one to the bit. This bit is used only in dual-panel mode (SDS=1). When this bit
is set, an interrupt request is made to the interrupt controller if it is unmasked (ERM=0).
11.7.11.11 Output FIFO Overrun Upper Panel Status (OOU) (read/write,
maskable interrupt)
The output FIFO overrun upper panel status (OOU) bit is set when the LCD’s dither logic attempts
to place data into the upper panel’s output FIFO after it has been completely filled. It is cleared by
writing a one to the bit. This bit is used in single-panel mode (SDS=0) and dual-panel mode
(SDS=1). When this bit is set, an interrupt request is made to the interrupt controller if it is
unmasked (ERM=0).
11.7.11.12 Output FIFO Underrun Upper Panel Status (OUU) (read/write,
maskable interrupt)
The output FIFO underrun upper panel status (OUU) bit is set when the upper panel’s output FIFO
is completely empty and the LCD’s data pin driver logic attempts to fetch data from the FIFO. It is
cleared by writing a one to the bit. This bit is used in single-panel mode (SDS=0) and dual-panel
mode (SDS=1). When this bit is set, an interrupt request is made to the interrupt controller if it is
unmasked (ERM=0).
The following table shows the location of the status and flag bits in LCSR. For reserved bits, writes
are ignored and reads return zero. Set status bits should be cleared by software before enabling
both the LCD controller and interrupt controller.
Address: 0h B010 0004 LCSR: LCD Status Register
Read/Write &
Read-Only
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Reserved
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Reserved OUU OOU OUL OOL IUU IOU IUL IOL ABC BER BAU LFD
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
Bit Name Description
0 LDD LCD disable done flag.
0 – LCD has not been disabled and the last active frame completed.
1 – LCD has been disabled and the last active frame has just completed.
1 BAU Base address update flag (read-only).
0 – Base address has been written and has not yet been transferred to the current
address register.
1 – Base address has been transferred to the current address register, triggered either
by enabling the LCD or when the current address pointer equals the end address value
calculated by the LCD.