参数资料
型号: P89C668HFA
厂商: NXP SEMICONDUCTORS
元件分类: 微控制器/微处理器
英文描述: 80C51 8-bit Flash microcontroller family 64KB ISP FLASH with 8KB RAM
中文描述: 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQCC44
封装: PLASTIC, MS-018, SOT-187-2, LCC-44
文件页数: 10/54页
文件大小: 299K
代理商: P89C668HFA
Philips Semiconductors
Preliminary data
P89C668
80C51 8-bit Flash microcontroller family
64KB ISP Flash with 8KB RAM
2001 Jul 27
10
I
2
C SERIAL COMMUNICATION — SIO1
The I
2
C serial port is identical to the I
2
C serial port on the 8XC552,
8XC654, and 8XC652 devices. The operation of this subsystem is
described in detail in the 8XC552 section of this manual.
Note that in both the P89C668 and the 8XC552 the I
2
C pins are
alternate functions to port pins P1.6 and P1.7. Because of this,
P1.6 and P1.7 on these parts do not have a pull-up structure as
found on the 80C51. Therefore P1.6 and P1.7 have open drain
outputs on the P89C668.
Serial Control Register (S1CON) – See Table 3
S1CON (D8H)
CR2
ENS1
STA
STO
SI
AA
CR1
CR0
Bits CR0, CR1 and CR2 determine the serial clock frequency that is generated in the master mode of operation.
Table 3.
Serial Clock Rates
BIT FREQUENCY (kHz) AT f
OSC
6 MHz
8 MHz
CR2
CR1
CR0
3 MHz
12 MHz
2
15 MHz
2
117
1
134
1
156
1
188
1
31
250
1
500
1
1.22 < 52.1
0 < 250
f
OSC
DIVIDED BY
128
112
96
80
480
60
30
48
×
(256 – (reload value Timer 1))
Reload value Timer 1 in Mode 2.
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
23
27
31
37
6.25
50
100
47
54
63
75
12.5
100
200
62.5
71
83.3
100
17
133
1
267
1
94
107
1
125
1
150
1
25
200
1
400
1
0.24 < 62.5
0 < 255
0.49 < 62.5
0 < 254
0.65 < 55.6
0 < 253
0.98 < 50.0
0 < 251
NOTES:
1. These frequencies exceed the upper limit of 100 kHz of the I
2
C-bus specification and cannot be used in an I
2
C-bus application.
2. At f
OSC
= 12 MHz/15 MHz the maximum I
2
C bus rate of 100 kHz cannot be realized due to the fixed divider rates.
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