BU34440 [ROHM]
Single-chip 4-bit microcontroller for; 单芯片4位微控制器
| 型号： | BU34440 |
| 厂家： | 
ROHM |
| 描述： | Single-chip 4-bit microcontroller for |
| 文件： | 总7页 (文件大小：150K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Optical disc ICs
Single-chip 4-bit microcontroller for
CD-DA
BU34440
The BU34440 is a single-chip 4-bit microcontroller designed for CD-DA and contains parallel I / O, serial I / O, tim-
er / counter and all other functions required for CD control in a single compact package.
FApplications
FPin assignments
Portable CD-DA devices, portable CD stereos
FFeatures
1) Low-voltage, high-speed operation (VDD=2.3 X 5.5V
at 4.4MHz).
2) 4k byte ROM, 256 nibble RAM.
3) Internal 8-bit SIO (LSB first).
4) 14 programmable pull-up input / outputs.
5) 5 programmable pull-up inputs.
FAbsolute maximum ratings (Ta = 25_C)
101
Optical disc ICs
BU34440
FBlock diagram
102
Optical disc ICs
BU34440
FPin descriptions
103
Optical disc ICs
BU34440
FInput / output circuits
104
Optical disc ICs
BU34440
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VDD = 5V)
105
Optical disc ICs
BU34440
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VDD = 3V)
106
Optical disc ICs
BU34440
FHardware descriptions
(1) Operates on a single power supply (VDD=2.3 X
(7) Two energy-saving modes (STOP / HALT)
5.5V).
(8) Internal 8-bit timer counter
(2) Memory size
(9) Internal serial I / O, simplifying interface with at-
tached LSIs (LSB first)
ROM: 4096 8 bits
RAM: 256 4 bits
(10) 14 programmable pull-up input / outputs
(11) 5 programmable pull-up inputs
(3) Instruction execution time (1 cycle instruction)
1.5µsec: (at 4MHz)
(4) Subroutine nesting : 8 levels
(5) Interrupts: 4 factors
External: 2 factors
Internal (timer / counter, serial I / O)
: 2 factors
(6) ROM data table function (data table area : 4kB)
FExternal dimensions (Units: mm)
107
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