HD4074329S Renesas Electronics America, HD4074329S Datasheet - Page 52

• 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
Timer Mode Register A (TMA: $008): Four-bit write-only register that controls timer A as shown in
table 24.
Table 24
TMA
Bit 3 Bit 2
0
1
Notes: 1. t
Timer Mode Register B (TMB: $009): Four-bit write-only register that selects the auto-reload function,
input clock source, and the prescaler division ratio as shown in table 25. It is initialized to $0 by MCU
reset.
Writing to this register is valid from the second instruction execution cycle. Timer B initialization set by
writing to TMB must be done after a mode change becomes valid.
48
0
1
0
1
2. t
3. Timer counter overflow output period (seconds) = input clock period (seconds)
4. If PSW or TCA reset is selected while the LCD is operating, LCD operation halts (power switch
5. The division ratio must not be modified during time-base mode operation, otherwise an overflow
goes off and all SEG and COM pins are grounded).
When an LCD is connected for display, the PSW and TCA reset periods must be set in the
program to the minimum.
cycle error will occur.
subcyc
cyc
Timer Mode Register A
= 1.9074 s (when 4.1943-MHz crystal oscillator is used)
Bit 1 Bit 0 Source Prescaler, Input Clock Period, Operating Mode
0
1
0
1
0
1
0
1
= 244.14 s (when 32.768-kHz crystal oscillator is used)
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
PSS, 2048 t
PSS, 1024 t
PSS, 512 t
PSS, 128 t
PSS, 32 t
PSS, 8 t
PSS, 4 t
PSS, 2 t
PSW, 32 t
PSW, 16 t
PSW, 8 t
PSW, 2 t
PSW, 1/2 t
Do not use
PSW, TCA reset
cyc
cyc
cyc
subcyc
subcyc
cyc
subcyc
subcyc
cyc
cyc
subcyc
cyc
cyc
Timer A mode
Time-base mode
256.