TMP91xy20AFG Toshiba, TMP91xy20AFG Datasheet - Page 26

• Manufacturer Part Number: TMP91xy20AFG
• Manufacturer: Toshiba

Specifications of TMP91xy20AFG

• Package: LQFP144
• Rom Types(m=mask,p=otp, F=flash,e=eeprom): M
• Rom Combinations: 8
• Ram Combinations: 8
• Architecture: 16-bit CISC
• Usb/spi Channels: -
• Uart/sio Channels: 1
• I2c/sio Bus Channels: 1
• (s)dram Controller: 1
• Adc 10-bit Channel: 8
• Da Converter: -
• Timer 8-bit Channel: 4
• Timer 16-bit Channel: 1
• Pwm 8-bit Channels: -
• Pwm 16-bit Channels: -
• Cs/wait Controller: 4
• Dual Clock: Y
• Number Of I/o Ports: 77
• Power Supply Voltage(v): 3.0 to 3.6

3.3.4
3.3.5
ACT1 to ACT0
DFM output: f
Lockup timer
<DLUPFG>
System clock f
DFMCR0
DFMCR1
LUP:
X: Don’t care
Note: Input frequency limitation and correction for DFM.
Prescaler Clock Controller
can divide the clock.
divided by 2. The setting of the SYSCR0<PRCK0:1> register determines which clock signal
is input. When it’s used internal SBI circuit, <PRCK1:0> register must be set to 00.
Clock Doubler (DFM)
low-frequency oscillator, even though the internal clock is high frequency.
For the internal I/O (TMRA01 to TMRA23, SIO0 to SIO1,SBI) there is a prescaler which
The φ T clock input to the prescaler is either the clock f
DFM outputs the f
A reset initializes DFM to stop status, setting to DFMCR0 register is needed before use.
Like an oscillator, this circuit requires time to stabilize. This is called the lockup time.
The following example shows how DFM is used.
DFM
SYS
Recommend to use input frequency (High-speed oscillation) for DFM in the following
condition.
EQU
EQU
LD
LD
BIT
JR
LD
f
OSCH
Starts DFM operation.
Starts lockup.
00E8H
00E9H
(DFMCR1), 0BH
(DFMCR0), 01X0XXXXB
5, (DFMCR0)
NZ, LUP
(DFMCR0), 10X0XXXXB
= 4 MHz to 9 MHz (Vcc = 2.7 V to 3.6 V): Write 0BH to DFMCR1.
DFM
Counts up by f
clock signal, which is four times as fast as f
91C820A-24
01
OSCH
During lockup
;
;
;
;
;
Parameter setting.
Set lockup time to 2
Enables DFM operation and starts lockup.
Detects end of lockup.
Changes fc from 4 MHz to 16 MHz.
Ends of lockup
Changes from 4 MHz to 16 MHz.
FPH
12
After lockup
/4 MHz.
divided by 2 or the clock fc/16
10
OSCH
. It can use the
TMP91C820A
2008-02-20