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參數(shù)資料
| 型號(hào)： | HD40A4369 |
| 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)： | 39/115頁(yè) |
| 文件大?。?/td> | 710K |
| 代理商： | HD40A4369 |
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HD404369 Series
39
Bit
Initial value
Read/Write
Bit name
3
0
W
SSR13
*
1
2
0
W
SSR12
0
—
—
Not used
1
0
W
SSR11
System clock selection register 1 (SSR1: $027)
System Clock Selection
0.4 to 1.0 MHz
1.6 to 5.0 MHz (HD404369 Series)
1.6 to 8.5 MHz (HD40A4369 Series)
SSR11
0
1
SSR12
0
1
Ratio Selection
f
SUB
= f
X
/8
f
SUB
= f
X
/4
32-kHz Oscillation Division
SSR13
0
1
32-kHz Oscillation Stop
Oscillation operates in stop mode
Oscillation stops in stop mode
*
2
Notes:
1.
SSR13 will only be cleared to 0 by a
RESET
input. A
STOPC
input during stop mode will
not clear SSR13. Also note that SSR13 will not be cleared upon transition to stop mode.
If f
= 0.4 to 1.0 MHz, SSR11 must be set 0; if f
= 1.6 to 8.5 MHz, SSR11 must be set to
1. Do not use f
OSC
= 1.0 to 1.6 MHz with 32-kHz oscillation.
2.
Figure 23 System Clock Selection Register 1 (SSR1)
System Clock Selection Register 2 (SSR2: $028):
Four bit write-only register which is used to select the
system clock divisor (figure 24).
The division ratio of the system clock can be selected as 1/4, 1/8, 1/16, or 1/32 by setting bits 0 and 1
(SSR20, SSR21) of system clock select register 2 (SSR2).
The values of SSR20 and SSR21 are valid after the MCU enters watch mode. The system clock must be
stopped when the division ratio is to be changed.
There are two methods for changing the system clock divisor, as follows.
In active mode, set the divisor by writing to SSR20 and SSR21. At this point, the prior divisor setting
will remain in effect. Now, switch to watch mode, and then return to active mode. When active mode
resumes, the system clock divisor will have switched to the new value.
In subactive mode, set the divisor by writing to SSR20 and SSR21. Then return to active mode through
watch mode. When active mode resumes, the system clock divisor will have switched to the new value.
(The change will also take effect for direct transition to active mode.)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD40A4369F | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-bit HMCS400-Series microcomputer |
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| HD40A4369S | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-bit HMCS400-Series microcomputer |
| HD40A4372 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:HMCS43XXFamily User＇s Manual/Device |
| HD40A4372FT | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Low-Voltage AS Microcomputers with On-Chip A/D Converter |
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