731
Bits 6 to 4—Standby Timer Select 2 to 0 (STS2 to STS0): These bits select the MCU wait time
for clock stabilization when shifting to high-speed mode or medium-speed mode by using a
specific interrupt or command to cancel software standby mode, watch mode, or sub-active mode.
With a quartz oscillator (table 22-5), select a wait time of 8ms (oscillation stabilization time) or
more, depending on the operating frequency. With an external clock, there are no specific wait
requirements.
Bit 6
Bit 5
Bit 4
STS2
STS1
STS0
Description
0
0
0
Standby time = 8192 states
1
Standby time = 16384 states
1
0
Standby time = 32768 states
1
Standby time = 65536 states
1
0
0
Standby time = 131072 states
1
Standby time = 262144 states
(Initial value)
1
0
Reserved
1
Standby time = 16 states
Bit 3—Output Port Enable (OPE): This bit specifies whether the output of the address bus and
bus control signals (
AS
,
RD
,
HWR
,
LWR
) is retained or set to high-impedance state in the
software standby mode, watch mode, and when making a direct transition.
Bit 3
OPE
Description
0
In software standby mode, watch mode, and when making a direct transition, address
bus and bus control signals are high-impedance.
1
In software standby mode, watch mode, and when making a direct transition, the
output state of the address bus and bus control signals is retained.
(Initial value)
Bits 2 to 0—Reserved: These bits always return 0 when read, and cannot be written to.
Summary of Contents for H8S/2645
Page 4: ......
Page 16: ......
Page 58: ...26 ...
Page 110: ...78 ...
Page 120: ...88 ...
Page 132: ...100 ...
Page 160: ...128 ...
Page 172: ...140 ...
Page 418: ...386 ...
Page 444: ...412 ...
Page 530: ...498 ...
Page 562: ...530 ...
Page 642: ...610 ...
Page 662: ...630 ...
Page 688: ...656 ...
Page 756: ...724 ...
Page 784: ...752 ...
Page 812: ...780 ...
Page 837: ...805 A 2 Instruction Codes Table A 2 shows the instruction codes ...
Page 1152: ...1120 ...