參數(shù)資料
型號(hào)： SAA5667HL/NNNN
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP100
封裝： 14 X 14 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-407-1, LQFP-100
文件頁(yè)數(shù)： 60/112頁(yè)
文件大小： 537K
代理商： SAA5667HL/NNNN
2004 Sep 03
51
Philips Semiconductors
Product specication
Enhanced TV microcontrollers with
On-Screen Display (OSD)
SAA56xx
SAA56XX
A
<17_LN
A
<15_BK
ROMBK1
ROMBK0
ROM
A17
A16
A15
mgu488
Fig.14 Additional glue logic required to address 256 kbytes of external ROM.
21 MEMORY INTERFACE
The memory interface controls access to the embedded
DRAM, refreshing of the DRAM and page clearing. The
DRAM is shared between Data Capture, display and
microcontroller sections.
The Data Capture section uses the DRAM to store
acquired information that has been requested. The display
reads from the DRAM information and converts it to RGB
values. The microcontroller uses the DRAM as embedded
auxiliary RAM.
21.1
Memory structure
The memory is partitioned into two distinct areas, the
dedicated Auxiliary RAM area and the Display RAM area.
When not being used for Data Capture or display, the
Display RAM area can be used as an extension to the
auxiliary RAM area.
21.1.1
AUXILIARY RAM
The Auxiliary RAM is not initialised at power-up and must
be initialised by the application software. Its contents are
maintained during Idle mode and Standby mode, but are
lost if Power-down mode is entered.
21.1.2
DISPLAY RAM
The Display RAM is initialised on power-up to a value of
20H throughout. The contents of the Display RAM are
maintained when entering Idle mode. If Idle mode is exited
using an interrupt, the contents are unchanged, if Idle
mode is exited using an external reset, the contents are
initialised to 20H.
Full Closed Caption display requires display RAM from
8000H to 845FH. The memory from 8460H to 84FFH
(must be initialised by the application software) can be
utilised as an extension to the dedicated contiguous
Auxiliary RAM that occupies 0000H to 07FFH.
21.2
Memory mapping
The dedicated auxiliary RAM area occupies 2 kbytes, with
an address range from 0000H to 07FFH. The Display
RAM occupies a maximum of 12 kbytes with an address
range from 2000H to 5000H for TXT mode and
8000H to 84FFH for CC mode (see Fig.15). Although
having different address ranges, the two modes occupy
physically the same DRAM area.
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