Philips Semiconductors
Product specification
On/off logic IC
SAA1305T
Table 8 Definition of the control register bits
BIT
DESCRIPTION
part of the mask register; corresponds to input D7; a logic 1 disables input D7 (no influence on pin CHI)
7
6
5
4
3
2
1
0
part of the mask register; corresponds to input D6; a logic 1 disables input D6 (no influence on pin CHI)
part of the mask register; corresponds to input D5; a logic 1 disables input D5 (no influence on pin CHI)
part of the mask register; corresponds to input D4; a logic 1 disables input D4 (no influence on pin CHI)
content of bits 3 and 2 corresponds with the pulse width of the reset pulse output; see Table 9
control bit for pin ON/OFF; a logic 0 sets pin ON/OFF to VSS; a logic 1 sets pin ON/OFF to VDD
control bit (ENABLE-RESET) for the IC modes; only setting a logic 0 is possible; standby mode with disabled
Watchdog timer, enabled reset generation, ON/OFF = LOW and CHI = 3-state; with the rising edge of the
reset pulse output the IC enters the run mode with enabled Watchdog timer, disabled reset generation,
ON/OFF = HIGH (but controllable via control register bit 1) and CHI = HIGH (is active, not in 3-state)
Table 9 Pulse width of the reset pulse output
Table 12 Control bits for the blink LED frequency
BIT 3 BIT 2
PULSE WIDTH (ms)
BIT 3 BIT 2
FREQUENCY
2 Hz (0.5 s)
1 Hz (1 s)
0
0
1
1
0
1
0
1
20
10
5
0
0
1
1
0
1
0
1
0.67 Hz (1.5 s)
0.5 Hz (2 s)
1
Table 10 Definition of the LED register bits
Table 13 Control bits for the blink LED duration time
BIT
7
DESCRIPTION
BIT 1 BIT 0
DURATION TIME (ms)
bits 7 and 6 are function control bits;
see Table 11
0
0
1
1
0
1
0
1
20
30
40
50
6
5
no function
4
reset I2C-bus error counter
3
bits 3 and 2 are control bits for the blink LED
frequency (output LOW time); see Table 12
2
1
bits 1 and 0 are control bits for the blink LED
duration time; see Table 13
0
Table 11 Function control bits
BIT 7 BIT 6
FUNCTION
0
0
0
1
LED output switched to ground
blink function according the LED
register bits 0 to 3
1
1
0
1
LED output switched to VDD
blink function according the LED
register bits 0 to 3
2004 Jan 15
14
PANASONIC [ PANASONIC ]
