Intel 8XC196Lx Manuale Utente

2-6

To program these bits, write the correct value to the locations shown in Table 2-4 using slave pro-
gramming mode. During normal operation, you can determine the values of these bits by reading
the UPROM SFR (Figure 2-5).

You can verify a UPROM bit to make sure it programmed, but you cannot erase it. For this rea-
son, Intel cannot test the bits before shipment. However, Intel does test the features that the UP-
ROM bits enable, so the only undetectable defects are (unlikely) defects within the UPROM cells
themselves.

The internal peripheral modules provide special functions for a variety of applications. This sec-
tion provides a brief description of the peripherals that differ between the 8XC196Lx and the
8XC196Kx families.

Address:

Reset State:

1FF2H

XXH

The UPROM special-function register 1 (USFR1) reflects the status of unerasable, programmable 
read-only memory (UPROM) locations. This read-only register reflects the status of two bits that 
control the output frequency on CLKOUT.

—

—

—

—

—

—

CLK1

CLK0

7:2

—

Reserved.

1:0

CLK1:0

CLKOUT Control

These bits reflect the programmed frequency of the CLKOUT signal:

0

0

divide by 1 (CLKOUT = f/2)

0

1

divide by 2 (CLKOUT = f/4)

1

0

divide by 4 (CLKOUT = f/8)

1

1

divide by 1 (CLKOUT = f/2)

CLK0

0001H

0768H

CLK1

0002H

0728H