HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 359
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HD6413008F
Manufacturer Part Number
HD6413008F
Description
Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6413008F.pdf
(686 pages)
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Bit 6—Reset Output Enable (RSTOE): Enables or disables external output at the RESO pin of
the reset signal generated if TCNT overflows during watchdog timer operation. Note that there is
no RESO pin in the versions with on-chip flash memory.
Bits 5 to 0—Reserved: These bits cannot be modified and are always read as 1.
11.2.4
The watchdog timer's TCNT, TCSR, and RSTCSR registers differ from other registers in being
more difficult to write. The procedures for writing and reading these registers are given below.
Writing to TCNT and TCSR: These registers must be written by a word transfer instruction.
They cannot be written by byte instructions. Figure 11.2 shows the format of data written to
TCNT and TCSR. TCNT and TCSR both have the same write address. The write data must be
contained in the lower byte of the written word. The upper byte must contain H'5A (password for
TCNT) or H'A5 (password for TCSR). This transfers the write data from the lower byte to TCNT
or TCSR.
Bit 6
RSTOE Description
0
1
TCNT write
TCSR write
Note:
Notes on Register Access
Reset signal is not output externally
Reset signal is output externally
Address
Address
*
Lower 20 bits of the address in advanced mode.
Figure 11.2 Format of Data Written to TCNT and TCSR
H'FFF8C *
H'FFF8C *
15
15
H'5A
H'A5
Rev.4.00 Aug. 20, 2007 Page 315 of 638
8 7
8 7
Write data
Write data
11. Watchdog Timer
REJ09B0395-0400
(Initial value)
0
0
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