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| 型號(hào)： | 935263156557 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | PLASTIC, QFP-80 |
| 文件頁(yè)數(shù)： | 27/76頁(yè) |
| 文件大小： | 567K |
| 代理商： | 935263156557 |
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Philips Semiconductors
Product specification
P83C557E4/P80C557E4/P89C557E4
Single-chip 8-bit microcontroller
1999 Mar 02
33
When SIO1 is in a master mode serial clock frequency is
determined by the clock rate bits CR2, CR1 and CR0. The various
bit rates are shown in Table 25.
Table 25.
Selection of I2C-bus bit rate
BIT RATE (kHz) at fCLK
CR2
CR1
CR0
12MHz
16MHz
1
0
50
66.7
1
0
1
3.75
5
1
0
75
100
1
100
–
0
200 1
266.7 1
0
1
7.5
10
0
1
0
300 1
400 1
0
1
400 1
–
NOTE:
1. These bit rates are for “fast-mode” I2C bus applications and cannot be used for bit rates up to 100 kbit/sec.
The data shown in Table 25 do not apply to SIO1 in a slave mode. In
the slave modes, SIO1 will automatically synchronize with any clock
frequency up to 400kHz.
Serial status register S1STA
S1STA is a read only register.
The contents of the status register may be used as a vector to a
service routine. This optimizes the response time of the software
and consequently that of the I2C-bus.
Figure 31. Serial status (S1STA) register.
7
6
54
321
0
S1STA (D9H)
SC4
SC3
SC2
SC1
SC0
0
Table 26.
Description of S1STA bits
BIT
FUNCTION
S1STA.7 to 3
5-bit status code
S1STA.2 to 0
These bits are held LOW (for service routine vector increment 8)
The following is a list of the status codes:
Table 27.
MST/TRX mode
S1STA VALUE
DESCRIPTION
08H
A START condition has been transmitted
10H
A repeated START condition has been transmitted
18H
SLA and W have been transmitted, ACK has been received
20H
SLA and W have been transmitted, ACK received
28H
DATA and S1DAT has been transmitted, ACK received
30H
DATA and S1DAT has been transmitted, ACK received
38H
Arbitration lost in SLA, R/W or DATA
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