Programming Example - Intel 8XC196K Series User Manual

8.7

PROGRAMMING EXAMPLE

This code example configures SSIO0 as a master transmitter to send one byte of data to SSIO1,
the slave receiver. First it sets up a window to allow register-direct access to the necessary regis-
ters. Next, it configures the clock and data pins. Since SSIO0 is sending data, SC0 (P6.4) and SD0
(P6.5) are configured as special-function complementary outputs. Since SSIO1 is receiving data,
SC1 (P6.6) and SD1 (P6.7) are configured as special-function inputs. The example also sets up a
register (result) to store the received data byte.
wsr equ 014h:byte
p6_dir equ 0d3h:byte
p6_mode equ 0d1h:byte
p6_reg equ 0d5h:byte
ssio_baud equ 0b4h:byte
ssio0_con equ 0b1h:byte
ssio1_con equ 0b3h:byte
ssio0_buf equ 0b0h:byte
ssio1_buf equ 0b2h:byte
result equ 122h:byte
cseg at 2080h
ldb wsr,#1fh
ldb p6_dir,#0c0h
ldb p6_mode,#0f0h
ldb p6_reg,#0c0h
ldb ssio_baud,#80h
ldb ssio0_con,#0c9h
ldb ssio1_con,#08h
ldb ssio0_buf,#55h
d_wait:
jbc ssio1_con,0,d_wait
stb ssio1_buf,result
sjmp $
end
SYNCHRONOUS SERIAL I/O (SSIO) PORT
;window to 1fd3h
;window to 1fd1h
;window to 1fd5h
;window to 1fb4h
;window to 1fb1h
;window to 1fb3h
;window to 1fb0h
;window to 1fb2h
;register to store the received data byte
;select window 1fh
;set up SD1/SC1 as inputs and
;set up SD0/SC0 as complementary outputs
;set up SD1/SC1, SD0/SC0 as special-function
;set up SD1/SC1 inputs (1), SD0/SC0 outputs (0)
;enable baud-rate generator at 2 MHz
;set up channel 0 as master transmitter
;set up channel 1 as slave receiver
;transmit data 55h
;wait for data to be received
;store received data in "result"
8-15