tmp88fw45afg TOSHIBA Semiconductor CORPORATION, tmp88fw45afg Datasheet - Page 25

• Manufacturer Part Number: tmp88fw45afg
• Description: 8 Bit Microcontroller Tlcs-870/x Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

2.1.4
2.1.4.1
2.1.4.2
System Clock Control Circuit
The System Clock Control Circuit consists of a clock generator, timing generator, and standby control circuit.
supplied to the CPU core and peripheral hardware units.
XOUT pins. Or a clock generated by an external oscillator can also be used. In this case, enter the external
clock from the XIN pin and leave the XOUT pin open. The TMP88FW45AFG does not support the CR
network that produces a time constant.
CPU core and peripheral hardware units. The Timing Generator has the following functions:
The Clock Generator generates the fundamental clock which serves as the reference for the system clocks
The high-frequency clock (frequency fc) can be obtained easily by connecting a resonator to the XIN and
Adjusting the oscillation frequency
The Timing Generator generates various system clocks from the fundamental clock that are supplied to the
Clock Generator
Timing Generator
Note:Although no hardware functions are provided that allow the fundamental clock to be monitored directly
XOUT
XIN
1. Generate a divider output (DVO) pulse
from the outside, the oscillation frequency can be adjusted by forwarding the pulse of a fixed frequency
(e.g., clock output) to a port and monitoring it in a program while interrupts and the watchdog timer are
disabled. For systems that require adjusting the oscillation frequency, an adjustment program must be
created beforehand.
Figure 2-3 Example for Connecting a Resonator
Figure 2-2 System Clock Control Circuit
(a) Using a crystal or
High-frequency
clock oscillator
generator
XIN
ceramic resonator
Clock
circuit
High-frequency Clock
XOUT
Timing generator control register
fc
Page 11
Timing generator
System clocks
(b) Using an external
XIN
TBTCR
oscillator
00036H
(Open)
XOUT
00038H
SYSCR1
Standby control circuit
System control register
00039H
SYSCR2
TMP88FW45AFG