pcd3349a NXP Semiconductors, pcd3349a Datasheet - Page 9

• Manufacturer Part Number: pcd3349a
• Description: 8-bit Microcontroller With Dtmf Generator
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7
Although the PCD3349A operates over a clock frequency
range from 1 to 16 MHz, f
chosen to take full advantage of the frequency generator
section.
8
In addition to the conditions given in the “PCD33xxA
Family” data sheet, all derivative registers are cleared in
the RESET state.
9
Since the oscillator is switched off, the frequency
generator receives no clock. It is suggested to clear both
the HGF and LGF registers before entering Stop mode.
This will cut-off the biasing of the internal amplifiers,
considerably reducing current requirements.
12 SUMMARY OF MASK OPTIONS
Table 7 Port mask options
Notes
1. Port output drives:
2. Port state after reset: S = Set (HIGH) and R = Reset (LOW).
Table 8 Mask options
1998 May 11
Port 0 (P0.0 to P0.7)
Port 1 (P1.0 to P1.7)
Port 2 (P2.0 to P2.7)
ROM code: program/data
Power-on-reset voltage level: V
Oscillator transconductance: g
8-bit microcontroller with DTMF generator
a) Option 1: standard I/O.
b) Option 2: open-drain I/O.
c) Option 3: push-pull output; see “PCD33xxA Family” data sheet.
TIMING
RESET
STOP MODE
PORT NAME
FEATURE
xtal
= 3.58 MHz will usually be
m
POR
OPTION 1
X
X
X
PORT OUTPUT DRIVE
Any mix of instructions and data up to ROM size of 4 kbytes.
1.2 to 3.6 V in increments of 100 mV; OFF
LOW transconductance: g
MEDIUM transconductance: g
HIGH transconductance: g
OPTION 2
X
X
X
9
10 IDLE MODE
In the Idle mode, the frequency generator remains
operative.
11 INSTRUCTION SET RESTRICTIONS
Since no serial I/O interface is provided, the serial I/O
(Input/Output) instructions are not available. ‘MOV Dx, A’
is the only applicable derivative instruction because the
derivative registers are write-only.
ROM space being restricted to 4 kbytes, SEL MB2/3 would
define non-existing Program Memory banks and should
therefore be avoided.
RAM space being restricted to 224 bytes, care should be
taken to avoid accesses to non-existing RAM locations.
(1)
OPTION 3
X
X
X
mL
mH
DESCRIPTION
mM
PORT STATE AFTER RESET
SET
X
X
X
Product specification
PCD3349A
RESET
X
X
X
(2)