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H838532H bảng dữ liệu(PDF) 255 Page - Renesas Technology Corp

tên linh kiện H838532H
Giải thích chi tiết về linh kiện  16-Bit Single-Chip Microcomputer H8 Family / H8/300H Super Low Power Series
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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H838532H bảng dữ liệu(HTML) 255 Page - Renesas Technology Corp

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Section 9 Timers
Rev. 1.00 May 30, 2008 Page 235 of 484
REJ09B0436-0100
9.4.3
CPU Interface
TCF and OCRF are 16-bit read/write registers, but the CPU is connected to the on-chip peripheral
modules by an 8-bit data bus. When the CPU accesses these registers, it therefore uses an 8-bit
temporary register (TEMP).
In 16-bit mode, TCF read/write access and OCRF write access must be performed 16 bits at a time
(using two consecutive byte-size MOV instructions), and the upper byte must be accessed before
the lower byte. Data will not be transferred correctly if only the upper byte or only the lower byte
is accessed.
In 8-bit mode, there are no restrictions on the order of access.
(1) Write Access
Write access to the upper byte results in transfer of the upper-byte write data to TEMP. Next, write
access to the lower byte results in transfer of the data in TEMP to the upper register byte, and
direct transfer of the lower-byte write data to the lower register byte.



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