參數(shù)資料
型號: AT85C51SND3B1-RTTUL
廠商: Atmel
文件頁數(shù): 51/119頁
文件大小: 0K
描述: IC DECODER/ENCODER DGTL 100-LQFP
標準包裝: 90
類型: 音頻編碼器/解碼器
應(yīng)用: 移動電話,手機,視頻顯示器
電壓 - 電源,數(shù)字: 1.65 V ~ 3.6 V
安裝類型: 表面貼裝
封裝/外殼: 100-LQFP
供應(yīng)商設(shè)備封裝: 100-LQFP(14x14)
包裝: 托盤
37
AT85C51SND3B
7632D–MP3–01/07
Special Function Registers
SFR Pagination
The AT85C51SND3B derivatives implement a SFR pagination mechanism which allows
mapping of high number of peripherals in the SFR space. As shown in Figure 24, four
pages are accessible through the PPCON (Peripheral Pagination Control) register (see
Table 37). The four bits of PPCON: PPS0 to PPS3 are used to select one page as
detailed in Table 36. Setting one bit of PPCON using the setb instruction automatically
clears the 7 others: e.g. if page 0 is selected, selecting page 3 is done by the instruction
setb
PPS3 which clears PPS0.
By default, after reset selected page is page 0.
The PPCON content is automatically saved in a specific stack at each interrupt service
routine entry during vectorization and restored at exit during reti execution.
Figure 24. SFR Pagination Block diagram
Table 36. Page Selection Truth Table
Reset Value = 0000 0001b
PPS3
PPS2
PPS1
PPS0
Selected Page
0
Page 0
X
1
Page 0
X
1
0
Page 1
X
1
0
Page 2
1
0
Page 3
Table 37. PPCON Register
PPCON (Y.C0h) – Peripheral Page Control Register
7
6
5
4
3
2
1
0
-
PPS3
PPS2
PPS1
PPS0
Bit
Number
Bit
Mnemonic Description
7-4
-
Reserved
The value read from these bits is always 0. Do not set these bits.
3-0
PPS3:0
Peripheral Page Select Bits
Refer to Table 36 for page decoding information.
0
1
S
F
R
D
E
C
O
D
E
R
2
PPS0
PPCON.0
PPS1
PPCON.1
4
to
2
E
N
C
O
D
E
R
2
3
PPS2
PPCON.2
PPS3
PPCON.3
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