P89C668 Philips Semiconductors, P89C668 Datasheet - Page 10

• Manufacturer Part Number: P89C668
• Description: 80C51 8-bit Flash microcontroller family 64KB ISP FLASH with 8KB RAM
• Manufacturer: Philips Semiconductors

1. These frequencies exceed the upper limit of 100 kHz of the I
2. At f
Philips Semiconductors
I
The I
8XC654, and 8XC652 devices. The operation of this subsystem is
described in detail in the 8XC552 section of this manual.
Serial Control Register (S1CON) – See Table 3
S1CON (D8H)
Bits CR0, CR1 and CR2 determine the serial clock frequency that is generated in the master mode of operation.
Table 3.
NOTES:
2001 Jul 27
2
C SERIAL COMMUNICATION — SIO1
CR2
CR2
80C51 8-bit Flash microcontroller family
64KB ISP Flash with 8KB RAM
0
0
0
0
1
1
1
1
2
C serial port is identical to the I
OSC
ENS1
CR1
= 12 MHz/15 MHz the maximum I
0
0
1
1
0
0
1
1
Serial Clock Rates
STA
CR0
0
1
0
1
0
1
0
1
STO
0.24 < 62.5
0 < 255
3 MHz
6.25
100
23
27
31
37
50
2
SI
C serial port on the 8XC552,
0.49 < 62.5
2
AA
C bus rate of 100 kHz cannot be realized due to the fixed divider rates.
0 < 254
6 MHz
BIT FREQUENCY (kHz) AT f
12.5
100
200
47
54
63
75
CR1
0.65 < 55.6
CR0
0 < 253
8 MHz
133
267
62.5
83.3
2
100
71
17
C-bus specification and cannot be used in an I
1
1
10
0.98 < 50.0
Note that in both the P89C668 and the 8XC552 the I
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.
12 MHz
0 < 251
OSC
107
125
150
200
400
94
25
1
1
1
1
1
2
1.22 < 52.1
15 MHz
0 < 250
134
156
188
250
500
117
31
1
1
1
1
1
1
2
48
Reload value Timer 1 in Mode 2.
(256 – (reload value Timer 1))
2
C-bus application.
f
OSC
DIVIDED BY
128
112
480
96
80
60
30
P89C668
Preliminary data
2
C pins are