HD4074329S Renesas Electronics America, HD4074329S Datasheet - Page 32

• Manufacturer Part Number: HD4074329S
• Description: MCU 4-Bit HMCS400 CISC 20KB EPROM 3.3V/5V 64-Pin SDIP
• Manufacturer: Renesas Electronics America

Specifications of HD4074329S

• Package: 64SDIP
• Family Name: HMCS400
• Maximum Speed: 4.5 MHz
• Ram Size: 268 Byte
• Program Memory Size: 20 KB
• Operating Supply Voltage: 3.3|5 V
• Data Bus Width: 4 Bit
• Program Memory Type: EPROM
• Number Of Programmable I/os: 35
• On-chip Adc: 4-chx8-bit
• Operating Temperature: -20 to 75 °C
• Number Of Timers: 3

HD404328 Series
Active Mode: The MCU operates according to the clock generated by the system oscillators OSC
OSC
Standby Mode: The MCU enters standby mode when the SBY instruction is executed from active mode.
In this mode, the oscillators, interrupts, timer/counters, and serial interface continue to operate, but all
instruction execution-related clocks stop. The stopping of these clocks stops the CPU, retaining all RAM
and register contents and maintaining the current I/O pin status.
The standby mode is terminated by a RESET input or an interrupt request. If it is terminated by RESET
input, the MCU is reset as well. After an interrupt request, the MCU enters active mode and resumes,
executing the next instruction after the SBY instruction. If the interrupt enable flag is 1, that interrupt is
then processed; if it is 0, the interrupt request is left pending and normal instruction execution continues. A
flowchart of operation in standby mode is shown in figure 11.
28
DTON:
LSON:
ø
ø
ø
ø
f
2
OSC
SUB
CPU
PER
CLK
.
f
cyc
ø
ø
ø
ø
ø
ø
ø
ø
f
X
OSC
OSC
Standby mode
CPU
CPU
PER
PER
CLK
CLK
:
:
:
:
:
:
:
f
f
X
X
Main oscillation frequency
Suboscillation frequency,
for time-base
f
f
System clock
Clock for time-base
Clock for other peripheral
functions
Low speed on flag
Direct transfer on flag
OSC
X
:
:
:
:
:
:
:
:
:
:
/8
Operating
Operating
Stopped
f
f
Operating
Operating
Stopped
f
f
cyc
SUB
cyc
cyc
/8
SBY (standby)
SBY (standby)
Interrupt
Interrupt
Figure 10 MCU Status Transitions
Subactive mode
ø
ø
ø
ø
ø
ø
ø
ø
ø
ø
ø
ø
OSC
CPU
OSC
CPU
OSC
CPU
PER
PER
PER
CLK
CLK
CLK
f
f
f
Active mode
X
X
X
Reset
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
Operating
Operating
f
f
f
Operating
Operating
f
f
f
Stopped
Operating
f
f
f
(TMA3 = 0)
(TMA3 = 1)
SUB
SUB
SUB
SUB
cyc
cyc
cyc
cyc
cyc
* 2
Notes:
STOP/SBY
(LSON = 1)
1. Interrupt source
2. STOP/SBY (DTON = 1, LSON = 0)
3. STOP/SBY (DTON = 0, LSON = 0)
4. DTON can be 0 or 1.
INT
time-base
INT
time-base
STOP
STOP
0,
0
STOP
,
*1
*4
*1
*3
(TMA3 = 1, LSON = 0)
(TMA3 = 1, LSON = 1)
ø
ø
ø
ø
ø
ø
ø
ø
ø
ø
ø
ø
OSC
OSC
OSC
CPU
PER
CPU
PER
CPU
PER
CLK
CLK
CLK
Watch mode
Stop mode
(TMA3 = 0)
f
f
f
X
X
X
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
Stopped
Operating
Stopped
Stopped
Stopped
Stopped
Operating
Stopped
f
Stopped
Stopped
Operating
Stopped
f
Stopped
SUB
SUB
1
and