參數資料
型號: SDA 5252
廠商: SIEMENS AG
英文描述: TVTEXT 8-Bit Microcontroller(ROM-Versions )(TV視頻的8位微控制器(含ROM 型 ))
中文描述: TVTEXT 8位微控制器(ROM的版本)(電視視頻的8位微控制器(含光盤型))
文件頁數: 76/143頁
文件大小: 1050K
代理商: SDA 5252
SDA 525x
Semiconductor Group
76
1998-04-08
capacitor, the more slowly
V
RST
decreases.
V
RST
must remain below the lower threshold of
the Schmitt Trigger long enough to effect a complete reset. The time required is the
oscillator start-up time plus 4 machine cycles.
Attention:
While reset is active and at least four machine cycles after rising edge of
RST, ALE, P4.0 and P3.6 should not be pulled down externally. Otherwise a special
production test mode is entered.
Figure 24
Power-On Reset Circuit
Power-Down Operations
The controller provides two modes in which power consumption can be significantly
reduced.
– Idle mode. The CPU is gated off from the oscillator. All peripherals are still provided
with the clock and are able to work.
– Power-down mode. Operation of the controller is turned off. This mode is used to save
the contents of internal RAM with a very low standby current.
Both modes are entered by software. Special function register PCON is used to enter
one of these modes.
UES04722
V
RST
10
μ
F
SS
DD
V
V
DD
SS
V
RST
V
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