M3850 Datasheet, PDF (58/88 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

3850 Group (Spec.A)
qClear Status Register Command
This command clears the bits (SR4, SR5) which are set when the
status register operation ends in error. When the “5016” command
code is sent with the 1st byte, the aforementioned bits are
cleared. When the clear status register operation ends, the SRDY1
(BUSY) signal changes from “H” to “L” level.
SCLK1
RxD
TxD
SRDY1(BUSY)
5016
Fig. 58 Timing for clear status register
qPage Program Command
This command writes the specified page (256 bytes) in the flash
memory sequentially one byte at a time. Execute the page pro-
gram command as explained here following.
(1) Transfer the “4116” command code with the 1st byte.
(2) Transfer addresses A8 to A15 and A16 to A23 (“0016”) with the
2nd and 3rd bytes respectively.
(3) From the 4th byte onward, as write data (D0 to D7) for the
page (256 bytes) specified with addresses A8 to A23 is input
sequentially from the smallest address first, that page is auto-
matically written.
When reception setup for the next 256 bytes ends, the SRDY1
(BUSY) signal changes from “H” to “L” level. The result of the
page program can be known by reading the status register. For
more information, see the section on the status register.
SCLK1
RxD
TxD
SRDY1(BUSY)
Fig. 59 Timing for page program
4116
A8 to A16 to
A15 A23
data0
Rev.2.10 2005.11.14 page 58 of 86
REJ03B0093-0210
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