參數(shù)資料
型號: SAA7348GP
廠商: NXP SEMICONDUCTORS
元件分類: 微控制器/微處理器
英文描述: All Compact Disc Engine ACE
中文描述: 8-BIT, MROM, 35 MHz, MICROCONTROLLER, PQFP100
文件頁數(shù): 32/60頁
文件大?。?/td> 205K
代理商: SAA7348GP
1997 Jul 11
32
Philips Semiconductors
Preliminary specification
All Compact Disc Engine (ACE)
SAA7348GP
8.1.10
D
ATA
D
IRECTION
R
EGISTERS
(DDR0, DDR2
AND
DDR3)
The data direction registers are used to control the direction of data flow at the port pins (P0, P2 and P3). DDR0 controls
P0; DDR2 controls P2; DDR3 controls P3. A logic 0 written to a bit makes the relevant port an input port. A logic 1 makes
it an output port. The register is byte addressable; R/W.
Table 24
Data direction registers (address DDR0: 0XFBH; DDR2: 0XFCH; DDR3: 0XFDH); note 1
Table 25
Description of DDR bits
Note to Tables 24 and 25
1.
X = 0, 2 or 3, depending on register selected (DDR0, DDR2 or DDR3).
7
6
5
4
3
2
1
0
Srv_frc_flock
Srv_frc_lock
Srv_otd
Srv_da
Srv_cl
Srv_rab
Srv_startup
Serv_halt
BIT
SYMBOL
DESCRIPTION
(1)
7
6
5
4
3
2
1
0
DDROUTX7
DDROUTX6
DDROUTX5
DDROUTX4
DDROUTX3
DDROUTX2
DDROUTX1
DDROUTX0
controls direction of PX.7
controls direction of PX.6
controls direction of PX.5
controls direction of PX.4
controls direction of PX.3
controls direction of PX.2
controls direction of PX.1
controls direction of PX.0
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