HD4074329S Renesas Electronics America, HD4074329S Datasheet - Page 19

• 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

Reset
The MCU is reset by inputting a high-level voltage to the RESET pin. At power-on or when stop mode is
cancelled, RESET must be high for at least one t
RESET must be high for at least two instruction cycles.
Initial values after MCU reset are shown in table 1.
Table 1
Item
Program counter
Status flag
Stack pointer
Interrupt
flags/mask
I/O
Timer/
counters, serial
interface
Initial Values After MCU Reset
Interrupt enable flag
Interrupt request flag (IF)
Interrupt mask
Port data register
Data control register
Port mode register A
Port mode register B
Port mode register C (PMRC)
Interrupt mode
register
Timer mode
register A
Timer mode
register B
Timer mode
register C
Serial mode register
Prescaler S
Prescaler W
Timer counter A
Timer counter B
Abbr.
(PC)
(ST)
(SP)
(IE)
(IM)
(PDR)
(DCR)
(PMRA)
(PMRB)
(IMR)
(TMA)
(TMB)
(TMC)
(SMR)
(TCA)
(TCB)
RC
Initial Value
$0000
1
$3FF
0
0
1
All bits 1
All bits 0
0000
- - 00
0000
0000
0000
0000
0000
0000
$000
$00
$00
$00
to enable the oscillator to stabilize. During operation,
Contents
Indicates program execution point from
start address of ROM area
Enables conditional branching
Stack level 0
Inhibits all interrupts
Indicates there is no interrupt request
Prevents (masks) interrupt requests
Enables output at level 1
Turns output buffer off (to high
impedance)
Refer to description of port mode register
A
Refer to description of port mode register
B
Refer to description of port mode register
C
Refer to description of interrupt mode
register
Refer to description of timer mode
register A
Refer to description of timer mode
register B
Refer to description of timer mode
register C
Refer to description of serial mode
register
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HD404328 Series
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