tmp88cu74 TOSHIBA Semiconductor CORPORATION, tmp88cu74 Datasheet - Page 10

• Manufacturer Part Number: tmp88cu74
• Description: Cmos 8-bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

High-frequency
clock
Low-frequency
clock
Timer/Counters
Serial
interface
Vacuum
fluorescent
tube driver
circuit
DV1CK = 0
Note 1: Do not set DV7CK to “1” in the single clock mode.
Note 2: In SLOW and SLEEP mode, the input clock to the 1st stage of the divider is stopped; output from the
NORMAL1, IDLE1 Mode
fc/2
fs
Single-clock Mode
SYSCK
DV7CK
DV1CK
8
1st to 6th stages is also stopped.
fc
fc
DV1CK = 1
Prescaler
0 1 2
fc/2
ç
9
Main system clock generator
Table 1.4.1 Input Clock to 7th Stage of the Divider
Selector
Figure 1.4.3 Configuration of Timing Generator
A
B
S
Y
1 2 3 4 5 6
DV1CK = 0
Divider
fc/2
NORMAL2, IDLE2 Mode (SYSCK = 0)
8
88CU74-10
DV7CK = 0
Selector
A
B
S
Y
DV1CK = 1
7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
fm
Dual-clock Mode
fc/2
Machine cycle counters
9
Divider
DV7CK = 1
ç
fs
Note: fm = fc or fs
B0
B1
A0 Y0
A1 Y1
S
TMP88CU74
(SYSCK = 1)
Selector
2007-10-19
2003-02-17
Stand-by
controller
Watchdog
timer
Time base
timer
SLOW,
SLEEP
Divider
output
Mode
fs