X88C75 datasheet(13/27 Pages) XICOR

13 / 27 page

X88C75 SLIC® E2

reload value for 9600 baud rate and write it into the

X88C75 location 00E8H. The XSLIC software, a PC

based communication driver, automates changing of

the default parameters when using its SETUP option

menu. The boot-firmware (SLIC) residing on the X88C75

contains a lookup table which can be accessed from the

subroutine (EXEC_SUB), located at location 0126H.

Two bytes are used per table entry. The EXEC_SUB

input requirements are as follows:

R0 = Contains a Function Number from the following

Function Table.

The table entry at location (014E-014FH) is reserved for

user’s application code. This function will be executed

on power-up if the SLIC receives any characters other

than those for the RESET (ASCII ‘R’), or ID (ASCII ‘X’)

commands. The table entry can be changed to point to

other code responsible for power-up initialization. This is

preferred method than changing the reset vector, since

the SLIC code can still be invoked upon power-up.

Other functions available through the EXEC_SUB calls

is as follows:

the interrupt is enabled, an external interrupt will be

asserted at the completion of the internal write cycle.

The interrupt is cleared by setting EOW to “0”.

USING A PORT IN BIDIRECTIONAL MODE

In order to use a port in bidirectional mode, it has to be

configured as an open drain output port. Small pull-up

resistors are required on all port output pins. Bit posi-

tions in the Port Data Register corresponding to port

inputs should contain “1”. The inputs are then read by

accessing PPR. Data is not latched into the device, so

the inputs must stay valid throughout the read cycle. The

port strobe pin is configured as an output and cannot be

used as port latch clock input.

The current version of the SLIC E2 configures the 80C51

serial port to the variable baud rate mode. It sets a timer

1 reload value for a system clock rate of 11.059MHz. For

other clock rates end user must recalculate timer 1

SLIC FUNCTIONS (80C51 Specific SLIC)

The resident SLIC E2 has designated memory spaces

allocated for its use. The user’s application code should

avoid using these areas as part of its code segment,

otherwise it will overwrite the SLIC E2. Version 3.0 of the

X88C75 SLIC E2 occupies 256 bytes in the upper

memory bank, starting at address 1F00H, and 288 bytes

in the lower bank’s address range 30H-14FH. Prior to

downloading code, assemble and link the source files

using the above address information. Use memory

space taken up by the SLIC E2 as a run-time data

storage, if there is no further need to modify the X88C75

SLIC E2 content.

FUNCTION NO.

DESCRIPTION

0 - PROC_PROG

Download and program a

page

1 - PROC_BPR

Program BPR

2 - RESET

Start execution from

location 0000H

3 - PROC_VER

Download and verify a page

4 - DUMMY

Command not recognized

5 - INIT_UART

Initialize UART parameters

to default

6 - PROG_PG

Program a page

7 - SEND_CHAR

Send a character to the

UART

8 - GET_CHAR

Read a character from the

RAM receive buffer (40H-5FH)

9 - SDP_HI_PLANE

Generate SDP off sequence

for upper plane

10- SDP_LO_PLANE Generate SDP off sequence

for lower plane

11- USER_CODE

Execute user’s code

2887 PGM T03.1

For detailed information about the listed functions, in-

cluding their input requirements, refer to the SLIC soft-

ware specification document.

SLIC

0000H

0030H

0150H

01F00H

SLIC

User’s Program/Data

2887 ILL F17

ISR & Reset Vectors

Figure 13.

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