tmp88cu74 TOSHIBA Semiconductor CORPORATION, tmp88cu74 Datasheet - Page 13

• Manufacturer Part Number: tmp88cu74
• Description: Cmos 8-bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

(a) Single-clock mode
(b) Dual-clock mode
Operating Mode
Note: NORMAL1 and NORMAL2 modes are generically called NORMAL;
RESET1
NORMAL1
IDLE1
STOP1
NORMAL2
IDLE2
SLOW
SLEEP
STOP2
SLEEP
IDLE1
mode
mode
IDLE2
mode
4.
5.
STOP1 and STOP2 are called STOP; and IDLE1, IDLE2 and SLEEP are called IDLE.
SLEEP mode
active. The CPU, the watchdog timer, and the internal oscillation circuit of the
high-frequency clock are halted; however, on-chip peripherals remain active
(operate using the low-frequency clock). Starting and releasing of SLEEP mode
are the same as for IDLE1 mode, except that operation returns to SLOW mode.
STOP2 mode
mode, and as in SLOW mode at the start, it returns to SLOW mode after release.
In this mode, the internal oscillation circuit of the low-frequency clock remains
As in STOP1 mode, all system operations are halted in this mode.
As in NORMAL2 mode at the start, the operating mode returns to NORMAL2
Figure 1.4.7 Operating Mode Transition Diagram
Turning on
Turning off
Turning on
Turning off
oscillation
oscillation
oscillation
oscillation
frequency
High-
Instruction
Instruction
Instruction
Interrupt
Interrupt
Interrupt
Frequency
Turning off
Turning on
Turning off
frequency
oscillation
oscillation
oscillation
Low-
88CU74-13
NORMAL1
NORMAL2
Instruc-
RESET
SLOW
mode
mode
mode
tion
High-frequency
Low-frequency
Instruction
Reset release
CPU Core
Operate
Reset
Halt
Halt
Halt
Release
input
Release input
Instruction
Instruction
On-chip Peripherals
Instruction
(High and/or Low)
Low-frequency
Operate
Operate
Reset
Halt
Halt
STOP1
STOP2
mode
mode
Machine Cycle Time
4/fc [s]
4/fc [s]
4/fs [s]
TMP88CU74
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2007-10-19
2003-02-17