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HD64F2149YV bảng dữ liệu(PDF) 1068 Page - Renesas Technology Corp

tên linh kiện HD64F2149YV
Giải thích chi tiết về linh kiện  Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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Appendix E Timing of Transition to and Recovery from Hardware Standby Mode
Rev. 3.00 Jan 18, 2006 page 1040 of 1044
REJ09B0280-0300
Appendix E Timing of Transition to and Recovery from
Hardware Standby Mode
E.1
Timing of Transition to Hardware Standby Mode
(1) To retain RAM contents with the RAME bit set to 1 in SYSCR, drive the
RES signal low 10
system clock cycles before the
STBY signal goes low, as shown in figure E.1. RES must
remain low until
STBY signal goes low (minimum delay from STBY low to RES high: 0 ns).
STBY
RES
t2 ≥ 0 ns
t1 ≥ 10tcyc
Figure E.1 Timing of Transition to Hardware Standby Mode
(2) To retain RAM contents with the RAME bit cleared to 0 in SYSCR, or when RAM contents do
not need to be retained,
RES does not have to be driven low as in (1).
E.2
Timing of Recovery from Hardware Standby Mode
Drive the
RES signal low at least 100 ns before STBY goes high to execute a reset.
STBY
RES
tOSC1
t
≥ 100 ns
Figure E.2 Timing of Recovery from Hardware Standby Mode



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