Mitsubishi microcomputers
M16C / 62 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
CPU Rewrite Mode (Flash Memory Version)
Program status (SR4)
The program status informs the operating status of auto write operation to the CPU. When a write
error occurs, it is set to 1.
The program status is reset to 0 when cleared.
When an erase command is in error (which occurs if the command entered after the block erase
command (2016) is not the confirmation command (D016), both the program status and erase status
(SR5) are set to 1.
When the program status or erase status = 1, the following commands entered by command write are
not accepted.
Also, in one of the following cases, both SR4 and SR5 are set to 1 (command sequence error):
(1) When the valid command is not entered correctly
(2) When the data entered in the second bus cycle of lock bit program (7716/D016), block erase
(2016/D016), or erase all unlock blocks (A716/D016) is not the D016 or FF16. However, if FF16 is
entered, read array is assumed and the command that has been set up in the first bus cycle is
canceled.
Block status after program (SR3)
If excessive data is written (phenomenon whereby the memory cell becomes depressed which results
in data not being read correctly), “1” is set for the program status after-program at the end of the page
write operation. In other words, when writing ends successfully, “8016” is output; when writing fails,
“9016” is output; and when excessive data is written, “8816” is output.
Table 1.29.2. Definition of each bit in status register
Definition
Each bit of
SRD
Status name
"1"
Ready
-
"0"
Busy
-
SR7 (bit7)
SR6 (bit6)
SR5 (bit5)
SR4 (bit4)
SR3 (bit3)
SR2 (bit2)
SR1 (bit1)
SR0 (bit0)
Write state machine (WSM) status
Reserved
Erase status
Terminated normally
Terminated in error
Program status
Block status after program
Reserved
Terminated normally
Terminated in error
Terminated normally
Terminated in error
-
-
-
-
-
-
Reserved
Reserved
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