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HD151TS207SS
Rev.1.00, Apr.25.2003, page 20 of 38
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C Controlled Register Bit Map (cont.)
Byte22 Control Register
Bit Description Contents Type Default Note
7 CPU Frequency Read Bit7 R 0
6 CPU Frequency Read Bit6 R 0
5 CPU Frequency Read Bit5 R 0
4 CPU Frequency Read Bit4
Calculation result of CPU frequency.
1 MHz digit
0000 = 0, 0001 = 1 …. 1001 = 9
R0
3 CPU Frequency Read Bit3 R 0
2 CPU Frequency Read Bit2 R 0
1 CPU Frequency Read Bit1 R 0
0 CPU Frequency Read Bit0
Calculation result of CPU frequency.
0.1 MHz digit
0000 = 0, 0001 = 1 …. 1001 = 9
R0
Byte23 Control Register
Bit Description Contents Type Default Note
7 Watchdog Enable Control Bit 0 = Disable , Pin22 = 3V66_0 output
1 = Enable , Pin22 = RESET# output
R/W 0
6 RESET# Reverse Control Bit 0 = Normal , 1 = Reverse R/W 0
5 Watchdog Timer Count Bit3 R/W 1
4 Watchdog Timer Count Bit2 R/W 0
3 Watchdog Timer Count Bit1 R/W 0
2 Watchdog Timer Count Bit0
These 4 bits corresponds to how
many watchdog timer will wait from
becoming “Alarm mode” (B23[0] = 1)
to outputting RESET# pin to “Low”.
Default is 586ms x8 = 4.7s at Power
ON
R/W 0
1 Backup Frequency Select Bit 0 = B10[4:0] , 1 = B11[4:0]
When SAFE_F# is “Low” , frequency
mode is changed to the predefined
frequency mode decided by B10[4:0]
or B11[4:0].
R/W 0
0 Watchdog Status Bit 0 = Normal mode, 1 = Alarm mode R/W 0