upd17072 Renesas Electronics Corporation., upd17072 Datasheet - Page 178
upd17072
Manufacturer Part Number
upd17072
Description
4-bit Single-chip Microcontroller With Hardware For Digital Tuning System
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD17072.pdf
(226 pages)
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19.3 Clock Stop Function
executed.
instruction when the CE is at the high level.
V
19.3.1 Clock stop status
stop their operations.
Statuses.
19.3.2 Releasing clock stop status
the program is started from address 0000H, regardless of which of (1) and (2) has been used to release the clock
stop status.
19.3.3 Releasing clock stop status by CE reset
178
DD
(1) Raise the CE pin from low to high (CE reset).
(2) Lower the supply voltage V
The clock stop function stops the 75 kHz crystal resonator when the “STOP s” instruction (clock stop status) is
Therefore, the current dissipation of the device is reduced to 3 A maximum (T
As the operand “s” of the “STOP s” instruction, “0000B” is specified.
The “STOP s” instruction is valid only when the CE pin is at the low level, and is executed as a no-operation (“NOP”)
Therefore, the “STOP s” instruction must be executed when the CE pin is at the low level.
The clock stop mode can be released by CE reset rising the CE pin, or by power-ON reset with supply voltage
In the clock stop status, the crystal resonator is stopped. As a result, the CPU and all the peripheral hardware
For the operations of the CPU and peripheral hardware, refer to 19.4 Device Operations in Halt and Clock Stop
The clock stop status can be released in the following two ways. After the clock stop status has been released,
Figure 19-3 illustrates how the clock stop status is released by the CE reset.
application.
= –20 to +70 C, normal operation) (power-ON reset).
Note
This voltage is called power-ON clear voltage. The maximum value of the power-ON clear voltage is
1.8 V, and the actual value is in a range not exceeding this maximum value. For details, refer to 20.4.1
Power-ON clear voltage.
DD
of the device to 1.8 V or less
Note
, and then raise it again to 1.8 V or higher (T
A
= 25 C, V
DD
PD17072,17073
= 3.0 V).
A
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