Philips Semiconductors

Product specification

87C552

80C51 8-bit microcontroller

1998 May 01

7

Serial Control Register (S1CON) – See Table 2

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 2. Serial Clock Rates

CR2

CR1

CR0

6MHz

12MHz

16MHz

0

0

0

23

47

62.5

256

0

0

1

27

54

71

224

0

1

0

31.25

62.5

83.3

192

0

1

1

37

75

100

160

1

0

0

6.25

12.5

17

960

1

0

1

50

100

120

1

1

0

100

200

60

1

1

1

0.25 < 62.5

0.5 < 62.5

0.67 < 56

96

× (256 – (reload value Timer 1))

0 to 225

0 to 224

0 to 223

Timer 1 in Mode 2.

NOTE:

PARAMETER

RATING

UNIT

Storage temperature range

–65 to +150

°C

–0.5 to +13

V

–0.5 to +6.5

V

Input, output DC current on any single I/O pin

5.0

mA

Power dissipation (based on package heat transfer limitations, not device power

consumption)

1.0

W

NOTES:

1. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and

functional operation of the device at these or any conditions other than those described in the AC and DC Electrical Characteristics section

of this specification is not implied.

2. This product includes circuitry specifically designed for the protection of its internal devices from the damaging effects of excessive static

charge. Nonetheless, it is suggested that conventional precautions be taken to avoid applying greater than the rated maxima.

noted.

DEVICE SPECIFICATIONS

SUPPLY VOLTAGE (V)

FREQUENCY (MHz)

TYPE

MIN

MAX

MIN

MAX

TEMPERATURE RANGE (

°C)

P87C552-4

4.5

5.5

3.5

16

0 to +70

P87C552-5

4.5

5.5

3.5

16

–40 to +85