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PDF HCD404669 Data sheet ( Hoja de datos )
| Número de pieza | HCD404669 | |
| Descripción | Low-Voltage AS Microcomputers | |
| Fabricantes | Hitachi Semiconductor | |
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HD404669 Series
Low-Voltage AS Microcomputers with On-Chip DTMF
Generation Circuit
ADE-202-083B
Rev. 3.0
Sept. 1999
Description
The HD404669 Series microcomputers incorporate a DTMF generation circuit, two comparators, and a
serial interface on chip. They also provide input and output pins with large current handling capacities.
Thus they are 4-bit single-chip microcomputers that are optimal for use in multifunction telephones,
cordless telephones, and other communications equipment.
HD404669 Series microcomputers have a 32.768 kHz sub-oscillator for realtime clock use, providing a
time counting facility, and a variety of power supply modes to reduce current drain.
The HD407A4669 is a ZTAT™ microcomputer with on-chip PROM that drastically shortens development
time and ensures a smooth transition from debugging to mass production. (The PROM programming
specifications are the same as for the 27256 type.)
ZTAT™: Zero Turn-Around Time ZTAT is a trademark of Hitachi, Ltd.
Features
• 1,152-digit × 4-bit RAM
• I/O pins: 47
High-current I/O pins (source: 10 mA max.): 4
High-current I/O pins (sink: 15 mA max.): 5
• Timer counters: 3
• Input capture: one 8-bit channel
• Timer outputs: 2 (with PWM output capability)
• Event input: 1 (edge-programmable)
• Clock synchronous 8-bit serial interface: 1
• DTMF generation circuit
• Comparator: 2 channels
• System clock oscillator
Ceramic oscillator, crystal oscillator, or external clock operation possible
1 page  
Pad Arrangement
HCD404669
64 62 60 58 56 54 52 50
63 61 59 57 55 53 51 49
HD404669 Series
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
TYPE CODE
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
17 19 21 23 25 27 29 31
18 20 22 24 26 28 30 32
TYPE CODE: HD404669
5
5 Page 
HD404669 Series
RAM Memory Map
The MCU contains a RAM area consisting of a memory register area, a data area, and a stack area. In
addition, an interrupt control bits area, special function register area, and register flag area are mapped onto
the same RAM memory space. The RAM memory map is shown in figure 2 and described below.
RAM-Mapped Register Area ($000–$03F):
• Interrupt Control Bits Area ($000–$003)
This area is used for interrupt control bits (figure 3). These bits can be accessed only by RAM bit
manipulation instructions (SEM/SEMD, REM/REMD, and TM/TMD). However, note that not all the
instructions can be used for each bit. Limitations on using the instructions are shown in figure 4.
• Special Function Register Area ($004–$01F, $024–$03F)
This area is used as mode registers and data registers for external interrupts, serial interface, timers,
DTMF, comparator, and as data control registers for I/O ports. The structure is shown in figures 2 and
5. These registers can be classified into three types: write-only (W), read-only (R), and read/write
(R/W). RAM bit manipulation instructions cannot be used for these registers.
• Register Flag Area ($020–$023)
This area is used for the DTON, WDON, and other register flags and interrupt control bits (figure 3).
These bits can be accessed only by RAM bit manipulation instructions (SEM/SEMD, REM/REMD, and
TM/TMD). However, note that not all the instructions can be used for each bit. Limitations on using
the instructions are shown in figure 4.
11
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