SDA5252 SIEMENS [Siemens Semiconductor Group], SDA5252 Datasheet - Page 76

• Manufacturer Part Number: SDA5252
• Description: TVTEXT 8-Bit Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Semiconductor Group
capacitor, the more slowly V
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
– Power-down mode. Operation of the controller is turned off. This mode is used to save
Both modes are entered by software. Special function register PCON is used to enter
one of these modes.
with the clock and are able to work.
the contents of internal RAM with a very low standby current.
V
V
DD
SS
RST
V
RST
decreases. V
10 F
76
RST
must remain below the lower threshold of
V
V
RST
DD
SS
UES04722
SDA 525x
1998-04-08