saa7110 NXP Semiconductors, saa7110 Datasheet - Page 29

• Manufacturer Part Number: saa7110
• Description: One Chip Front-end 1 Ocf1
• Manufacturer: NXP Semiconductors

Philips Semiconductors
15.2
Power-on reset is activated at power-on (using only internal CGC) and if the supply voltage falls below 3.5 V. The RESET
signal can be applied to reset other circuits of the digital TV system.
Table 5 Power-on control sequence
1995 Oct 18
handbook, full pagewidth
Directly after power-on
asynchronous reset
Start synchronous
I
Status after I
Status after power-on
control sequence
INTERNAL POWER-ON
CONTROL SEQUENCE
2
C-bus reset sequence
One Chip Front-end 1 (OCF1)
Power-on control
2
C-bus reset Y7 to Y0, UV7 to UV0, HREF and HS held
Y7 to Y0, UV7 to UV0, RTCO, PLIN, ODD,
GPSW, SDA, HREF, HS, VS, HCL and HSY
in high impedance state
LLC, LLC2 and CREF in HIGH state
LLC, LLC2 and CREF active
in high impedance state
VS, HCL and HSY held in input function
mode
RTCO, PLIN, ODD, GPSW and SDA active
CGCE
PIN OUTPUT STATUS
LLC
Fig.19 Power-on control circuit.
CLOCK I/O
CONTROL
POC V DD
ANALOG
LOGIC
POC
29
CONTROL
CONTROL
POC V DD
OUTPUT
DIGITAL
ACTIVE
CLOCK
DELAY
direct switching to high impedance (outputs)
or input mode (I/Os) for 20 to 200 ms
starting I
SA0DH = 7DH (VTRC = 0, RTSE = 1,
HRMV = 1, SSTB = 0, SECS = 1)
SA0EH = 00H (HPLL = 0, OEHV = 0,
OEYC = 0, CHRS = 0, GPSW = 0)
SA31H = 00H (AOSL 1 : 0 = 00, WIRS = 0,
WRSE = 0, SQPB = 0, VBLKA = 0,
PULIO = 0)
after power-on (reset sequence) a complete
I
2
C-bus transmission is required
MGC838
2
C-bus reset sequence
SAA7110; SAA7110A
RESET
FUNCTION
Product specification