Sony AN-101 Service Manual page 10

— ICF-SW1
AN-101
SYMBOL NAMING DESCRIPTION
23 VCOL
24
Vssl
GROUND
Receives an AM local-oscillator signals, i.e., the VCO signal from 0.5 MHz to 40 MHz of
0.2 Vp-p minimum.
This port is selected when the direct frequency-dividing system or the Pulse-Swallow system
is used and, at the same time, the HF command is excecuted. These two systems are, how-
ever, different one another as shown below.
INPUT LEVEL INPUT FRE- DIVIDING
BLYIDING SYSTEM (MINIMUM) QUENCY RATIO
DIRECT 0.1 Vp-p 0.5 to 15 MHz 16 to (2'?-1)
PULSE-SWALLOW
(HF COMMAND
EXECUTED)
0.2 Vp-p 0.5 to 40 MHz 1,024 to (217-1)
This terminal is pulled down to the groung level when the Pulse-Swallow system is used to-
gether with the VHF-command execution, i.e., the VCOH (FM) terminal is selected. A
capacitor coupling is needed due to the inclusion of alternate current amplifiers inside this
chip. Not used.
The ground-return terminal of this device.
25
26
27
E01
E02
CE
ERROR
OUTPUT
ERROR
OUTPUT
CHIP
ENABLE
Transmits the error signal of the PLL system. When the resultant frequencies obtained by
dividing the local-oscillator frequencies are higher than the reference frequency, an "H"
(high)-level signal is output from this port. When these are lower, on the contrary, an "L"
(low)-level signal is output from this port. When these divided frequencies just coincide with
the reference frequency, this port becomes in a floating state. These output signals from
this port then go through the external lowpass filter to the varactor diodes in the turned
circuits in these frontends of the receiver. The same output waveform as the terminal E01
is obtainable from the next terminal E02, pin 26, and so these two are user-selectable.
When the PLL is disabled, ie., when the system is set by the PLL commands or the CE
terminal, pin 27, is set to the ''L" (low)-level, these E01 and E02 terminals become in the
floating states.
Receives the state-selection signals for this device.
When set a "H" (high), this device works, and vice versa. The PLL section of this device be-
comes forcively in a disabled condition in the duration of wider than 140 usec of the "L"
(low)-level state. The duration, however, of shorter than 140 usec is not taken into account.
The programmes are using the CKSTP commands. The CKSTP commands are effective only
when the state of this CE is in an "L" (low) condition. When this CE terminal isin an "H"
state, these programmes work like under NOP commands.
When the CKSTP commands are executed when this CE terminal is in an "L" (low) level,
the internal clock generator and the internal CPU are disabled. In this disabled condition,
the RAM-memory backupings can be made under a very-low current consumption of 3 uA
maximum. In this condition, these display-output signals LCD1 through LCD16 and the
COM1 COM3 become in the off-display mode, i.e., the '"'L" (low) state.
When the level of this CE terminal is changed from "L" to "H", this device is reset and its
programmes start from the location "0" (zero). In this state, the Port A becomes in the
input mode.
Goes to "L" (low) when main power switch is OFF or when the power supply is below 1.9V
(1.8 — 2.0 V).
28
29
xO
X1
CRYSTAL
OSCILLATOR
i
An external quartz-crystal oscillator connects to these terminals to obtain 75 kHz signal
generator for the devices.
30
33
1.
(30)
(31)
(32)
(33)
PA3 PORT A 4-bit 1/O (Input/Output) ports. These ports enable the device designate input or output bit
|
by bit. The each designation is, in turn, performed by the contents in the location' '1FH" in
PAO the "BANK 0 (zero)" in the data memory (RAM), called as a "PAIO word". At these
instances as the power-on, clock stoppage and the initial setting of the CE terninal from
"L" to "H", these terminals automatically become in the input ports.
Under the port-operation commands like "IN", "OUT", "SPB", "RPB" command, etc., the
PAO port coincides with the least significant bit of the registor or the operand
the PA3
coincides with the most-significant bit of them. The same applies to the port B aad Port C
respectively.
PA3 PORT A When receiving a broadcast station, it goes to "H" (high), and tuning LED lights, It is used
(SD) as a stop signal for scan function.
PA2 PORT A Initial key input port.
PAI PORT A Mode output.
PAO PORT A RADIO OFF; LW/MW i sw FM |
PAI p> "p>" | "ey" "A"? |
a PAO "p> oH" | op" cpp? |