saa569x NXP Semiconductors, saa569x Datasheet - Page 37

• Manufacturer Part Number: saa569x
• Description: Enhanced Tv Microcontrollers With On-screen Display Osd
• Manufacturer: NXP Semiconductors

andbook, full pagewidth
Philips Semiconductors
9
Two reset inputs are present on the device, the RESET pin
being active HIGH and RESET pin being active LOW. Only
one of these inputs need be connected in the system as
they are ORed internally to the device and each pin has
the necessary pull-down (for RESET) and pull-up (for
RESET) resistors at the pad.
An automatic reset can be obtained when V
on by connecting the RESET pin to V
10 F capacitor, providing the V
exceed 1 ms and the oscillator start-up time does not
exceed 10 ms.
2002 May 06
Enhanced TV microcontrollers with
On-Screen Display (OSD)
(1) Internal 14 kbyte data and display RAM of the device.
POWER-ON RESET
MOVX @ Ri,A
MOVX A, @ Ri
DD
rise time does not
DDP
Fig.9 Indirect addressing of MOVX RAM.
FFH
FFH
FFH
FFH
FFH
FFH
00H
00H
00H
00H
00H
00H
through a
DD
is switched
XRAMP SFR = FEH
XRAMP SFR = 01H
XRAMP SFR = 00H
XRAMP SFR = FFH
XRAMP SFR = FFH
XRAMP SFR = FFH
37
Alternatively, a capacitor connected to V
pull-up to V
be connected to the RESET pin.
To ensure correct initialisation, the RESET/RESET pin
must be held HIGH/LOW long enough for the oscillator to
settle following power-up, usually a few milliseconds
(application specific, typically 10 ms). Once the oscillator
is stable, a further 24 crystal clocks are required to
generate the reset. Once the above reset condition has
been detected, an internal reset signal is triggered (which
remains active for 2048 clock cycles).
GSA070
FFFFH
FF00H
4FFFH
4000H
20FFH
2000H
08FFH
0800H
01FFH
0100H
00FFH
0000H
DDP,
MOVX @ DPTR,A
MOVX A, @ DPTR
(e.g. 10 F capacitor; 16 k resistor) can
Not Allocated
Not Allocated
Allocated
Allocated
SAA567x; SAA569x
(1)
(1)
Objective specification
SSP
with a suitable