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参数资料
| 型号： | 7548 |
| 厂商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 单芯片8位CMOS微机 |
| 文件页数： | 47/73页 |
| 文件大小： | 1255K |
| 代理商： | 7548 |
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Rev.2.00
REJ03B0210-0200
Mar 15, 2007
Page 47 of 70
7548 Group
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
Fig 63. Block diagram of internal clock generating circuit
“00”: Low-speed mode
High-speed on-chip
oscillator (HSOCO)
1/4
1/2
Timing
φ
(Internal clock)
φ
SOURCE
“10”: High-speed mode
Clock division ratio selection bits
WIT
instruction
Low-speed on-chip
oscillator (LSOCO)
1/8
“01”: Middle-speed mode
“11”: Double-speed mode
Peripheral
function clock
generation circuit
(1/1 to 1/256)
Clock selection bits
High-speed on-chip oscillator
oscillation control bit
Low-speed on-chip oscillator
oscillation control bit
1/16
Prescaler 12
Timer 1
Oscillation stabilization time set timer
after release of the STP instruction
S
Q
R
Reset
Interrupt disable flag I
Interrupt request
X
IN
/X
CIN
oscillation
control bit
Bits 0 and 1 of FSROM1: setting of the oscillation method setection bits
“00”: Clock pins not used
P2
1
/X
IN
/X
CIN
Port P2
1
control circuit
P2
0
/X
OUT
/X
COUT
Port P2
0
control circuit
“10”
“01”
“00”
It is not possible to write “1” to the low-speed on-chip
oscillator oscillation control bit if low-speed on-chip
oscillator stop has been disabled by bit 4 in FSROM2.
Also, the low-speed on-chip oscillator does not stop
even if the STP instruction is executed.
X
IN
oscillation cannot be
selected as
SOURCE
if clock pins not used is
selected.
P2
1
/X
IN
/X
CIN
Port P2
1
control circuit
P2
0
/X
OUT
/X
COUT
“11”: External clock input
Noise filter
P2
1
/X
IN
/X
CIN
P2
0
/X
OUT
/X
COUT
Rf
“10”: 32 kHz quartz-
crystal oscillation
P2
1
/X
IN
/X
CIN
P2
0
/X
OUT
/X
COUT
Rf
“01”: Ceramic or quartz-
crystal oscillation
1/1 to 1/256
Peripheral
function
(Note 2)
(Note 2)
Reset
S
Q
R
Q
S
STP instruction
STP instruction
R
Notes 1:
The oscillation circuit is built in the P2
0
/X
OUT
/X
COUT
pin and the P2
1
/X
IN
/X
CIN
pin. When the Vcc of the microcomputer
is lower than the operation lower bound voltage even if these pins are used as I/O ports, the oscillation circuit is
connected and undefined values may be output from these pins.
2:
Although a feed-back resistor exists on-chip, an external feed-back resistor may be needed depending on conditions.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 7548_07 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:Standard Characteristics |
| 7548_0710 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 75481-001 | 功能描述:集管和线壳 BACKPANEL PINS RoHS:否 产品种类:1.0MM Rectangular Connectors 产品类型:Headers - Pin Strip 系列:DF50 触点类型:Pin (Male) 节距:1 mm 位置/触点数量:16 排数:1 安装风格:SMD/SMT 安装角:Right 端接类型:Solder 外壳材料:Liquid Crystal Polymer (LCP) 触点材料:Brass 触点电镀:Gold 制造商:Hirose Connector |
| 75481-002 | 功能描述:集管和线壳 BERGPIN - WITH LARGE STA-R RoHS:否 产品种类:1.0MM Rectangular Connectors 产品类型:Headers - Pin Strip 系列:DF50 触点类型:Pin (Male) 节距:1 mm 位置/触点数量:16 排数:1 安装风格:SMD/SMT 安装角:Right 端接类型:Solder 外壳材料:Liquid Crystal Polymer (LCP) 触点材料:Brass 触点电镀:Gold 制造商:Hirose Connector |
| 75481-004 | 功能描述:集管和线壳 BERGPIN RoHS:否 产品种类:1.0MM Rectangular Connectors 产品类型:Headers - Pin Strip 系列:DF50 触点类型:Pin (Male) 节距:1 mm 位置/触点数量:16 排数:1 安装风格:SMD/SMT 安装角:Right 端接类型:Solder 外壳材料:Liquid Crystal Polymer (LCP) 触点材料:Brass 触点电镀:Gold 制造商:Hirose Connector |
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