tmp19a43fzxbg TOSHIBA Semiconductor CORPORATION, tmp19a43fzxbg Datasheet - Page 18

• Manufacturer Part Number: tmp19a43fzxbg
• Description: 32bit Tx System Risc
• Manufacturer: TOSHIBA Semiconductor CORPORATION

3.3
Note 1: Before transition to SLOW/SLEEP mode can occur, the low-speed oscillator (fs) must be oscillating stably.
Note 2: When SLEEP mode is terminated, the device returns to the state in which it was placed before entering SLEEP mode.
Note 3: The state to which the device returns when STOP mode is terminated can be specified using system control register
A. When a clock generated by the PLL is used
SLEEP mode (fc only)
(I/O select operation)
Figure 3.3.32 Default States When the PLL is Used and Those When the PLL is Not Used
Clock/Standby Control
pins) and dual-clock mode (which uses the X1 and X2 pins as well as the XT1 and XT2 pins).
(only real-time clock
timer operating)
There are essentially two modes of clock operation: single-clock mode (which uses only the X1 and X2
Figure 3.3.1 shows the state transition diagram for each operation mode.
fosc:
fs:
fpll:
fc:
fgear:
System clock fsys: Clock frequency selected by SYSCR1<SYSCK>
fperiph:
(I/O select operation)
(CPU halted)
IDLE mode
SYSCR0.
(CPU halted)
IDLE mode
fc = fpll = fosc × 4
Figure 3.3.1 State Transition Diagrams for Different Modes
NORMAL mode
∴fsys = fosc/2
fperiph = fsys
fsys = fc/8
Instruction
Reset
Instruction
Interrupt
Clock frequency input via X1 and X2 pins
Clock frequency input via XT1 and XT2 pins
Clock frequency multiplied (x4) by PLL
Clock frequency selected by setting of PLLOFF pin
Clock frequency selected by SYSCR1<GEAR1:GEAR0>
Input clock for peripheral I/O prescaler
Instruction
Interrupt
Reset terminated
PLL clock used
PLLOFF pin (High)
(a) State transition in single-clock mode
Instruction
Interrupt
(b) State transition in dual-clock mode
Interrupt
TMP1942CY/CZ-17
NORMAL mode
(fc/gear value)
SLOW mode
NORMAL mode
(fc/gear value)
Reset
(fs)
Reset terminated
Reset
B. When the PLL is not used
Reset terminated
Interrupt
Instruction
Interrupt
NORMAL mode
∴fsys = fosc/16
fperiph = fsys
Instruction
fc = fosc/2
fsys = fc/8
Reset
Instruction
Interrupt
TMP1942CY/CZ
Reset terminated
PLL not used
PLLOFF pin (Low)
(all circuits turned off)
STOP mode
(all circuits turned off)
STOP mode