Table of Contents
Advertisement
(6) Address match detection method
In the SBI mode, a particular slave device can be selected by sending a slave address from the master device.
Address match detection is automatically executed by hardware.
With the slave address register (SVA), and if the wake-up function specification bit (WUP) = 1, CSIIF0 is set only
when the slave address transmitted from the master device matches the value set in SVA.
If bit 5 (SIC) of the interrupt timing specification register (SINT) is set to 1, the wake-up function does not operate
even with WUP = 1 (an interrupt request signal is generated in detecting a bus release). When the wake-up
function is used, clear SIC to 0.
Cautions 1. Slave selection/non-selection is detected by matching of the slave address received after
(7) Error detection
In the SBI mode, the serial bus SB0 (SB1) status being transmitted is fetched into the destination device, that
is, the serial I/O shift register 0 (SIO0). Thus, transmit errors can be detected in the following way.
(a) Method of comparing SIO0 data before transmission to that after transmission
In this case, if two data differ from each other, a transmit error is judged to have occurred.
www.DataSheet4U.com
(b) Method of using the slave address register (SVA)
Transmit data is set to both SIO0 and SVA and is transmitted. After termination of transmission, COI bit
(match signal coming from the address comparator) of the serial operating mode register 0 (CSIM0) is tested.
If it is "1", normal transmission is judged to have been carried out. If it is "0", a transmit error is judged to
have occurred.
364
CHAPTER 16 SERIAL INTERFACE CHANNEL 0 ( µ PD78014Y Subseries)
bus release (RELD = 1).
For this match detection, match interrupt request (INTCSI0) of the address to be generated
with WUP = 1 is normally used. Thus, execute selection/non-selection detection by slave
address when WUP = 1.
2. When detecting selection/non-selection without the use of interrupt request with WUP = 0,
do so by means of transmission/ reception of the command preset by program instead of
using the address match detection method.
Advertisement
Table of Contents
