參數(shù)資料
型號(hào)： S1C60L09D
元件分類： 微控制器/微處理器
英文描述： 4-BIT, MROM, 0.08 MHz, MICROCONTROLLER, UUC70
封裝： DIE-70
文件頁(yè)數(shù)： 4/62頁(yè)
文件大小： 476K
代理商： S1C60L09D
CHAPTER 2: POWER SUPPLY AND INITIAL RESET
6
EPSON
S1C60N09 TECHNICAL MANUAL
2.2 Initial Reset
To initialize the S1C60N09 Series circuits, an initial reset must be executed. There are three ways of doing this.
(1) Initial reset by the power-on reset circuit
(2) External initial reset via the RESET terminal
(3) External initial reset by simultaneous high input to K00–K03 (depending on mask option)
Figure 2.2.1 shows the configuration of the initial reset circuit.
OSC1
oscillation circuit
Power-on
reset circuit
Time authorize
circuit
OSC1
VSS
OSC2
K00
K01
K02
K03
VSS
Initial
reset
RESET
Noise
rejector
Fig. 2.2.1 Configuration of initial reset circuit
2.2.1 Power-on reset circuit
The power-on reset circuit outputs the initial reset signal at power-on until the oscillation circuit starts
oscillating.
Note: The power-on reset circuit may not work properly due to unstable or lower voltage input. The
following two initial reset method are recommended to generate the initial reset signal.
2.2.2 Reset terminal (RESET)
An initial reset can be executed externally by setting the reset terminal to high level. This high level must
be maintained for at least 1 sec (when oscillating frequency fosc = 32 kHz), because the initial reset circuit
contains a noise rejector circuit. When the reset terminal goes low the CPU starts operating.
2.2.3 Simultaneous high input to input ports (K00–K03)
Another way of executing an initial reset externally is to input a high signal simultaneously to the input
ports (K00–K03) selected with the mask option. The specified input port terminals must be kept high for
at least 1 sec (when oscillating frequency fosc = 32 kHz), because of the noise rejection circuit. Table
2.2.3.1 shows the combinations of input ports (K00–K03) that can be selected with the mask option.
Table 2.2.3.1 Input port combinations
A
Not used
B
K00*K01
C
K00*K01*K02
D
K00*K01*K02*K03
When, for instance, mask option D (K00*K01*K02*K03) is selected, an initial reset is executed when the
signals input to the four ports K00–K03 are all high at the same time.
Further, the time authorize circuit can be selected with the mask option. The time authorize circuit
performs initial reset, when the input time of the simultaneous high input is authorized and found to be
the same or more than the defined time (1 to 3 sec).
When this function is used, make sure that the specified ports do not go high at the same time during
normal operation.
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