參數(shù)資料
型號(hào)： P87C770
廠商： NXP Semiconductors N.V.
英文描述： Microcontrollers for NTSC TVs with On-Screen Display (OSD) and Closed Caption (CC)(在NTSC TV中應(yīng)用的具有屏幕顯示和字幕關(guān)閉特點(diǎn)的微控制器)
中文描述： 微控制器用于NTSC電視的屏幕顯示（OSD）和字幕（CC）的（在NTSC電視中應(yīng)用的具有屏幕顯示和字幕關(guān)閉特點(diǎn)的微控制器）
文件頁(yè)數(shù)： 17/80頁(yè)
文件大小： 266K
代理商： P87C770
1999 Jun 11
17
Philips Semiconductors
Product specification
Microcontrollers for NTSC TVs with On-Screen
Display (OSD) and Closed Caption (CC)
P8xCx70 family
Table 12
Selection of SCL frequency in Master mode
10.4
Status Register (S1STA)
S1STA is an 8-bit read-only Special Function Register. The contents of S1STA may be used as a vector to a service
routine. This optimizes response time of the software and consequently that of the I
2
C-bus. The status codes for all
possible modes of the I
2
C-bus interface are given in Table 16. The abbreviations used in Table 16 are defined in
Table 15.
Table 13
Status Register (SFR address D9H)
Table 14
Description of S1STA bits
Table 15
Abbreviations used in Table 16
CR2
CR1
CR0
f
osc
DIVISOR
60
1600
40
30
240
3200
160
120
BIT RATE (kHz) at f
osc
= 12 MHz
200
7.5
300
400
50
3.75
75
100
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
7
6
5
4
3
2
1
0
SC4
SC3
SC2
SC1
SC0
0
0
0
BIT
SYMBOL
DESCRIPTION
7 to 3
2 to 0
SC4 to SC0
5-bit status code; see Table 16.
These 3 bits are held LOW.
SYMBOL
DESCRIPTION
SLA
R
W
ACK
ACK
DATA
MST
SLV
TRX
REC
7-bit slave address
read bit
write bit
acknowledgment (Acknowledge bit = 0)
not acknowledge (Acknowledge bit = 1)
8-bit byte to or from the I
2
C-bus
master
slave
transmitter
receiver
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