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| 型號(hào)： | HD404448 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-bit HMCS400-Series microcomputer(4位單片微計(jì)算機(jī)) |
| 中文描述： | 4位HMCS400系列微機(jī)（4位單片微計(jì)算機(jī)） |
| 文件頁(yè)數(shù)： | 97/123頁(yè) |
| 文件大?。?/td> | 726K |
| 代理商： | HD404448 |
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HD404449 Series
97
A/D Converter
The MCU has a built-in A/D converter that uses a sequential comparison method with a resistor ladder. It
can measure four analog inputs with 8-bit resolution. As shown in the block diagram of figure 81, the A/D
converter has a 4-bit A/D mode register, a 1-bit A/D start flag, and a 4-bit plus 4-bit A/D data register.
Internal bus line (S2)
A/D mode register
(AMR)
A/D start flag
(ADSF)
A/D data register
(ADRU, ADRL)
IFAD
Internal bus line (S1)
Encoder
Control logic
COMP
–
S
D/A
Operating mode signal (set to 0 in stop mode,
watch mode, and subactive mode)
4
4
4
8
2
2
AN
0
AN
1
AN
2
AN
3
AV
CC
AV
SS
+
8
A/D interrupt
request flag
Figure 81 A/D Converter Block Diagram
A/D Mode Register (AMR: $016):
Four-bit write-only register which selects the A/D conversion period
and indicates analog input pin information. Bit 0 of the A/D mode register selects the A/D conversion
period, and bits 2 and 3 select a channel, as shown in figure 82.
A/D Start Flag (ADSF: $020, Bit 2):
One-bit flag that initiates A/D conversion when set to 1. At the
completion of A/D conversion, the converted data is stored in the A/D data register and the A/D start flag is
cleared. Refer to figure 86.
A/D Data Register (ADRL: $017, ADRU: $018):
Eight-bit read-only register consisting of a 4-bit lower
digit and 4-bit upper digit. This register is not cleared by reset. After the completion of A/D conversion,
the resultant eight-bit data is held in this register until the start of the next conversion (figures 83, 84, and
85).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| HD404448H | 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:HD404449 SERIES |
| HD404448TF | 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:HD404449 SERIES |
| HD404449 | 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:HD404449 SERIES |
| HD404449H | 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:HD404449 SERIES |
| HD404449SERIES | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述: |
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