P87C654X2 datasheet(10/88 Pages) PHILIPS

Part #	P87C654X2

Description	80C51 8-bit microcontroller family 16 kB OTP/ROM, 256B RAM, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)

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Manufacturer	PHILIPS [NXP Semiconductors]

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Philips Semiconductors

Product data

P83C654X2/P87C654X2

80C51 8-bit microcontroller family 16 kB OTP/ROM,

256B RAM, low voltage (2.7 to 5.5 V), low power, high speed

(30/33 MHz)

2004 Apr 20

10

CLOCK CONTROL REGISTER (CKCON)

This device allows control of the 6-clock/12-clock mode by means of

both an SFR bit (X2) and an OTP bit. The OTP clock control bit

OX2, when programmed (6-clock mode), supersedes the X2 bit

(CKCON.0). The CKCON register is shown below in Figure 1.

X2

BIT

SYMBOL

FUNCTION

CKCON.7

–

Reserved.

CKCON.6

Reserved.

CKCON.5

Reserved.

CKCON.4

Reserved.

CKCON.3

Reserved.

CKCON.2

Reserved.

CKCON.1

Reserved.

CKCON.0

X2

CPU clock; 1 = 6 clocks for each machine cycle, 0 = 12 clocks for each machine cycle

SU01689

–

Not Bit Addressable

CKCON

Address = 8Fh

Reset Value = x0000000B

76

54

321

0

––

–

Figure 1. Clock control (CKCON) register

Also please note that the clock divider applies to the serial port for

modes 0 and 2 (fixed baud rate modes). This is because modes 1

and 3 (variable baud rate modes) use either Timer 1 or Timer 2.

Below is the truth table for the CPU clock mode.

Table 1.

OX2 clock mode bit

(can only be set by

parallel programmer)

X2 bit

(CKCON.0)

CPU clock mode

erased

0

12-clock mode

(default)

erased

1

6-clock mode

programmed

X

6-clock mode

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