Renesas 7700 FAMILY User Manual page 446

Error check command
Figure 19.2.6 shows the error check command execution timing.
The command code "80
When inputting the serial clock, the error information is output externally.
When an error occurs, the serial communication circuit sets the corresponding error flag to "1" and
stops operating, and the serial clock and data are not accepted (even including an error check
command). Accordingly, apply the V
apply the V
PP
circuit. The error information is output when first executing the error check command after initializing.
Figure 19.2.7 shows the error information.
The error flag becomes "0" by executing the error check command. Be sure to execute the error
check command because the error flag is undefined after power–on.
Note: When outputting the error information, the SDA pin is switched for output at the
Fig. 19.2.6 Error check command execution timing
" is input at the first transfer.
16
H level again to select the serial I/O mode and initialize the serial communication
SCLK
0 0 0 0 0 0
SDA
Command code input (80
"H"
OE
BUSY
"L"
first falling edge of the serial clock. The SDA pin is switched in the floating state
during the t period after the last rising edge of the serial clock (at the 8th
h(C-E)
bit).
7751 Group User's Manual
FLASH MEMORY VERSION
L level to the V pin to clear the serial I/O mode and then
PP PP
t
CH
E0E1
0 1
Error information
)
16
output (Note)
19.2 Serial input/output mode
? ? ? ? ? ?
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