HD404654 Datasheet, PDF (6/111 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

HD404654 Series
Pin Description
Item
Power supply
Test
Reset
Oscillator
Port
Interrupt
Stop clear
Serial
Timer
DTMF
Comparator
Division rate
Pin Number
Symbol
DP-42S FP-44A I/O Function
V_CC
GND
42
38
11
6
Applies power voltage
Connected to ground
TEST
7
2
RESET
10
5
I Used for factory testing only: Connect this pin to
V_CC
I Resets the MCU
OSC₁
OSC₂
D₀–D₉
8
9
12–21
3
4
7–16
I
O
I/O Input/output pins addressed by individual bits;
pins D₄–D₉ are high-current sink pins that can
each supply up to 15 mA, D₀– D₃ are large-
current source pins that can each supply up to 10
mA
D₁₂, D₁₃
R0₀–R4₃
22, 23
24–40
17, 18
19–21,
23–36
I Input pins addressable by individual bits
I/O Input/output pins addressable in 4-bit units
RD₀, RD₁, RE₀ 1, 2, 6
INT₀, INT₁
23, 24
STOPC
22
39, 40,1 I
18, 19 I
17
I
Input pins addressable in 4-bit units
Input pins for external interrupts
Input pin for transition from stop mode to active
mode
SCK₁
SI₁
SO₁
TOC, TOD
38
39
40
34, 35
34
35
36
30, 31
I/O Serial clock input/output pin
I Serial receive data input pin
O Serial transmit data output pin
O Timer output pins
EVND
37
33
I Event count input pins
TONER
4
42
O Output pin for DTMF row signals
TONEC
3
41
O Output pin for DTMF column signals.
VT _ref
COMP₀,
COMP₁
VC _ref
5
43
Reference voltage pin for DTMF signals
Voltage condition is V_CC ≥ VT_ref ≥ GND.
1, 2
39, 40 I Analog input pins for voltage comparator
6
1
Reference voltage pin for inputting the threshold
voltage of the analog input pin.
SEL
41
37
I Input pin for selecting system clock division rate
rate after RESET input or after stop mode
cancellation.
1/4 division rate: Connect it to V_CC
1/32 division rate: Connect it to GND
4