TMP91xy40FG Toshiba, TMP91xy40FG Datasheet - Page 16

• Manufacturer Part Number: TMP91xy40FG
• Manufacturer: Toshiba

Specifications of TMP91xy40FG

• Package: LQFP100
• Rom Types(m=mask,p=otp, F=flash,e=eeprom): M/F
• Rom Combinations: 128
• Ram Combinations: 4
• Architecture: 16-bit CISC
• Usb/spi Channels: -
• Uart/sio Channels: 4
• I2c/sio Bus Channels: -
• (s)dram Controller: -
• Adc 10-bit Channel: 4
• Da Converter: -
• Timer 8-bit Channel: 4
• Timer 16-bit Channel: 3
• Pwm 8-bit Channels: -
• Pwm 16-bit Channels: -
• Cs/wait Controller: -
• Dual Clock: Y
• Number Of I/o Ports: 61
• Power Supply Voltage(v): 2.2 to 3.6

3.3.3
01 (2
10 (2
11 (2
SYSCR2<WUPTM1:0>
Warm-Up Time Setting
14
16
8
/ oscillation frequency)
/oscillation frequency)
/oscillation frequency)
System Clock Control Unit
(1) Switching between NORMAL mode and SLOW mode
the CPU core and internal I/O. It accepts either fc or fs clock pulses generated by the
high-frequency or low-frequency oscillator, respectively. SYSCR1<SYSCK> is used to
select the high-frequency or low-frequency oscillator. SYSCR0<XEN> and <XTEN> are
used to enable and disable the high-frequency and low-frequency oscillators, respectively,
so that power consumption can be reduced.
system clock f
and X2 pins, the f
The system clock control unit generates system clock pulses (f
A system reset initializes <XEN> to 1, <XTEN> to 0 and <SYSCK> to 0, setting the
Note 1: If the oscillator to be used has stable oscillation, no warm-up time is needed.
Note 2: Since the warm-up timer is operated by an oscillation clock, warm-up times may include some errors if
between the X1 and X2 pins or between the XT1 and XT2 pins before switching the
system clock frequency. This warm-up time can be selected by SYSCR2<WUPTM1:0>
according to the properties of the resonator to be used. SYSCR0<WUEF> is used to
start the warm-up timer and to check whether or not the warm-up time has elapsed.
For how to program the warm-up timer, refer to examples 1 and 2 on the pages that
follow.
Table 3.3.1 Warm-Up Times (for changing the system clock frequency)
A warm-up timer is provided to ensure stable oscillation of the resonator connected
Table 3.3.1 shows the warm-up times for changing the system clock frequency.
there are fluctuations in oscillation frequency.
SYS
to fc/2. For example, if a 27 MHz resonator is connected between the X1
SYS
Changing to NORMAL Mode (fc)
clock operates at 13.5 MHz.
0.607 [ms]
2.427 [ms]
9.5 [μs]
91CW40-14
Changing to SLOW Mode (fs)
2000 [ms]
500 [ms]
7.8 [ms]
SYS
) that are supplied to
TMP91CW40
at fc = 27MHz
2008-09-19
fs = 32.768kHz