UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 233

• Manufacturer Part Number: UPD78F9222MC(T)-5A4-A
• Description: 8BIT MCU, 4K FLASH, 256B RAM, 78F9222
• Manufacturer: NEC

Specifications of UPD78F9222MC(T)-5A4-A

• Controller Family/series: UPD78
• No. Of I/o's: 17
• Ram Memory Size: 256Byte
• Cpu Speed: 10MHz
• No. Of Timers: 4
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

13.2 Standby Function Operation
13.2.1 HALT mode
Note “Cannot be stopped” or “Stopped by software” is selected for low-speed internal oscillator by the option byte
Item
System clock
CPU
Port (latch)
16-bit timer/event counter 00
8-bit timer 80
8-bit timer
H1
Watchdog
timer
A/D converter
Serial interface UART6
Power-on-clear circuit
Low-voltage detector
External interrupt
(1) HALT mode
(for the option byte, see CHAPTER 17 OPTION BYTE).
The HALT mode is set by executing the HALT instruction.
The operating statuses in the HALT mode are shown below.
Caution Because an interrupt request signal is used to clear the standby mode, if there is an interrupt
Sets count clock to f
Sets count clock to f
System clock selected as
operating clock
“Low-speed internal oscillation
clock” selected as operating
clock
source with the interrupt request flag set and the interrupt mask flag clear, the standby mode
is immediately cleared if set.
Setting of HALT Mode
XP
RL
/2
to f
Table 13-2. Operating Statuses in HALT Mode
7
XP
/2
12
CHAPTER 13 STANDBY FUNCTION
Clock supply to CPU is stopped.
Operation stops.
Holds status before HALT mode was set.
Operable
Operable
Operable
Operable
Setting prohibited
Operable (Operation
continues.)
Operable
Operable
Always operates.
Operable
Operable
Oscillator Cannot Be
User’s Manual U16898EJ5V0UD
Low-Speed Internal
Stopped
Note
Operable
Operation stops.
Operation stops.
When Low-Speed Internal
Oscillation Continues
Low-Speed Internal Oscillator Can Be Stopped
Operation stops.
When Low-Speed Internal
Oscillation Stops
Note
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