Zilog Z8F0130 - Manual (Page 260)

Using the ANSI C-Compiler UM013037-1212
236
Zilog Developer Studio II – Z8 Encore!
User Manual
RI
RI (restore interrupt) is a Zilog intrinsic function that restores interrupt status. It is
intended to be paired with an earlier call to TDI(), which has previously saved the existing
interrupt status. See the
TDI section on page 239 for a discussion of that function. The
interrupt status to be restored is passed as a parameter to RI(). This function is an intrinsic
function and is inline expanded.
Synopsis
#include

intrinsic void RI(unsigned char istat);
Example
#include


void main(void)
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{
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unsigned char istat;
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istat = TDI();/* Test and Disable Interrupts */
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/* Do Something */
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RI(istat);/* Restore Interrupts */
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}
select_port
The select_port function is a Zilog function that selects the UART. The default is
_UART0. The init_uart function can be used to configure either _UART0 or _UART1
and select the UART passed as the current one for use. All calls to putch , getch , and
kbhit use the selected UART. You can also change the selected UART using the
select_port function without having to reinitialize the UART.
Synopsis
#include

int select_port( int port ) ;
Returns
A zero is returned on success; a nonzero is returned on failure.
Example
#include

#include
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void main(void)
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{
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init_uart(_UART0,_DEFFREQ,_DEFBAUD);
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init_uart(_UART1,_DEFFREQ,_DEFBAUD);
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select_port(_UART0);
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printf("Hello UART0\n"); // Write to uart0
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