tmp88fw45afg TOSHIBA Semiconductor CORPORATION, tmp88fw45afg Datasheet - Page 91

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

8.3
8.3.1
Table 8-1 Availability of oscillation frequency detector
RESET by internal reset (Note 1)
RESET by oscillation frequency
(Including warming up period)
Function
RESET by external reset
Note 1: Internal reset ; Watchdog timer reset, Address trap reset, System clock reset and Oscillation frequency detection reset.
External RESET
input
Internal RESET
Oscillation Frequency
Detector control
High-frequency
clock
"00H" to CLKSCR2 with CLKSCR1="F9H" disables the oscillation frequency detection.
to CLKSCR2. Reading from CLKSCR2 is always enabled without setting of CLKSCR1. CLKSCR1 is initialized
to "06H" by external reset and CLKSCR2 is initialized to "00H" by external reset. However, CLKSCR1 and
CLKSCR2 are not initialized by internal reset which are system clock, address trap, watchdog timer reset and
oscillation frequency detection reset.
disabled. After releasing STOP and warming up period, the oscillation frequency detection is enabled. In serial
PROM mode for Flash, the oscillation frequency detection is disabled. The oscillation frequency detection is
available only in NORMAL and IDLE mode. Table 8-1 shows the availability of oscillation frequency detector.
Operating Mode
detection reset
Enabling and Disabling the Oscillation Frequency Detection
Serial PROM
Writing "E4H" to CLKSCR2 with CLKSCR1="F9H" enables the oscillation frequency detection, and writing
Setting "F9H" to CLKSCR1 enables writing to CLKSCR2 and setting "06H" to CLKSCR1 disables writing
When STOP mode is executed with CLKSCR2=E4H, the oscillation frequency detection is automatically
NORMAL
STOP
Note:After writing data to CLKSCR2, set "06H" to CLKSCR1 to protect CLKSCR2 register.
IDLE
VDD
Figure 8-3 Availabirity of Oscillation Frequency Detection
Disable
External
RESET
Oscillation Frequency Detection
NORMAL or
IDLE mode
Enabling by writting
E4H to CLKSCR
Enable
Available
Available
Available
Available
Disable
Disable
STOP mode
including warming up
Disable
Oscillation Frequency Detection is disabled automatically.
Page 77
NORMAL or
IDLE mode
All I/Os condition after Oscillation Frequency Detection RESET
Internal
RESET
Enable
NORMAL or
IDLE mode
High impedance
High impedance
High impedance
High impedance
External
RESET
Disable
-
-
Enable
NORMAL or
IDLE mode
Enabling by writting
E4H to CLKSCR
TMP88FW45AFG