h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 508
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h8s-2172
Manufacturer Part Number
h8s-2172
Description
Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2172.pdf
(570 pages)
- Current page: 508 of 570
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16.2.3
Transition to Hardware Standby Mode: When the STBY pin is driven low, a transition is made
to hardware standby mode from any mode.
In hardware standby mode, all functions enter the reset state and stop operation, resulting in a
significant reduction in power consumption. As long as the prescribed voltage is supplied, on-chip
RAM data is retained. I/O ports are set to the high-impedance state.
In order to retain on-chip RAM data, the RAME bit in SYSCR should be cleared to 0 before
driving the STBY pin low. Do not change the state of the mode pins (MD2, MD1) while this LSI
is in hardware standby mode.
Rev. 2.00, 03/04, page 476 of 534
Oscillator
φ
NMI
NMIEG
SSBY
Hardware Standby Mode
Figure 16.2 Software Standby Mode Application Example
NMI exception
handling
NMIEG=1
SSBY=1
SLEEP instruction
Software standby mode
(power-down mode)
stabilization
Oscillation
time t
OSC2
NMI exception
handling
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