hd64338342hw Renesas Electronics Corporation., hd64338342hw Datasheet - Page 365

• Manufacturer Part Number: hd64338342hw
• Description: Renesas 8-bit Single-chip Microcomputer H8 Family/h8/300l Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

9.7.4
Asynchronous event counter operation modes are shown in table 9.21.
Table 9.21 Asynchronous Event Counter Operation Modes
Operation
Mode
ECCSR
ECH
ECL
Note:
9.7.5
1. When reading the values in ECH and ECL, the correct value will not be returned if the event
2. In the H8/3847R Group, if the internal power supply step-down circuit is not used, the
counter increments during the read operation. Therefore, if the counter is being used in the 8-
bit mode, clear bits CUEH and CUEL in ECCSR to 0 before reading ECH or ECL. If the
counter is being used in the 16-bit mode, clear CUEL only to 0 before reading ECH or ECL.
maximum clock frequency to be input to the AEVH and AEVL pins is 16 MHz when Vcc =
4.5 to 5.5 V, 10 MHz when Vcc = 2.7 to 5.5 V, and 4 MHz when Vcc = 1.8 to 5.5 V. If the
internal power step-down circuit is used, the maximum clock frequency to be input is 10 MHz
when Vcc = 2.7 to 5.5 V, and 4 MHz when Vcc = 1.8 to 5.5 V. In the H8/3847S Group, the
maximum clock frequency to be input is 10 MHz when Vcc = 2.7 to 3.6 V, and 4 MHz when
Vcc = 1.8 to 3.6 V. In the H8/38347 Group and H8/38447 Group, the maximum clock
frequency to be input is 16 MHz when Vcc = 2.7 to 5.5 V. In addition, ensure that the high and
low widths of the clock are at least 32 ns. The duty cycle is immaterial.
* When an asynchronous external event is input, the counter increments but the counter
Asynchronous Event Counter Operation Modes
Application Notes
Reset
Reset
Reset
Reset
overflow H/L flags are not affected.
Active
Functions
Functions
Functions
Sleep
Functions
Functions
Functions
Watch
Held*
Functions* Functions
Functions* Functions
Subactive Subsleep
Functions
Rev. 6.00 Aug 04, 2006 page 329 of 680
Functions
Functions
Functions
Standby
Held*
Functions* Halted
Functions* Halted
REJ09B0145-0600
Section 9 Timers
Module
Standby
Held