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參數(shù)資料
| 型號(hào)： | HD404364 |
| 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)： | 38/115頁(yè) |
| 文件大?。?/td> | 710K |
| 代理商： | HD404364 |
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HD404369 Series
38
Oscillator Circuit
A block diagram of the clock generation circuit is shown in figure 22. As shown in table 20, a ceramic
oscillator or crystal oscillator can be connected to OSC
1
and OSC
2
, and a 32.768-kHz oscillator can be
connected to X1 and X2. The system oscillator can also be operated by an external clock.
Registers for Oscillator Circuit Operation
System Clock Selection Register 1 (SSR1: $027):
Four bit write-only register which sets the subsystem
clock frequency (f
SUB
) division ratio, and sets the subsystem clock oscillation in stop mode. Bit 1 (SSR11)
of system clock select register 1 must be set according to the frequency of the oscillator connected to OSC
1
and OSC
2
(figure 23).
Bit 1 (SSR11) and bit 2 (SSR12) are initialized to 0 on reset and in stop mode. Bit 3 (SSR13) is initialized
to 0 only on reset.
OSC
2
OSC
1
X1
X2
System
oscillator
Sub-
system
oscillator
1/4, 1/8,
1/16 or
1/32
division
circuit
*
1
Timing
generator
circuit
System
clock
selection
CPU with ROM,
RAM, registers,
flags, and I/O
Peripheral
function
interrupt
Time-base
interrupt
Time-base
clock
selection
1/8 or 1/4
division
circuit
*
2
Timing
generator
circuit
Timing
generator
circuit
1/8
division
circuit
f
W
t
Wcyc
f
SUB
t
subcyc
LSON
TMA3
f
cyc
t
cyc
f
OSC
f
X
CPU
PER
CLK
Notes:
1/4, 1/8, 1/16 or 1/32 division ratio can be selected by setting bits 0 and 1 of system clock
select register 2 (SSR2: $028).
1/8 or 1/4 division ratio can be selected by setting bit 2 of system clock select register 1
(SSR1: $027).
1.
2.
Figure 22 Clock Generation Circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD407A4369 | 4-bit HMCS400-Series microcomputer(4位單片微計(jì)算機(jī)) |
| HD4043612 | 4-bit HMCS400-Series microcomputer(4位單片微計(jì)算機(jī)) |
| HD404369 | 4-bit HMCS400-Series microcomputer |
| HD404369H | 4-bit HMCS400-Series microcomputer |
| HD404369S | 4-bit HMCS400-Series microcomputer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD404364F | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:microcomputer has an A/D converter |
| HD404364H | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-bit HMCS400-Series microcomputer |
| HD404364S | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:microcomputer has an A/D converter |
| HD404368 | 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 |
| HD404368F | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-bit HMCS400-Series microcomputer |
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