Panasonic MN101L Series User Manual page 149

High-speed Oscillation Clock Control Register (HCLKCNT: 0x03F05)
bp 7
Bit name HCLKSEL
Initial value 0
Access R/W
bp Bit name
7 HCLKSEL
6-5 FCNT1-0
4
3-2 Reserved
1 HOSCCNT
0 HRCCNT
The HCLKSEL must be set while the CPU is in NORMAL or IDLE mode, and both the HOSC-
CNT and the HRCCNT are "1". At this time, HOSCCLK and HRCCLK must be stable.
.. ..
6 5
FCNT1-0
1 1
R/W R/W
High-speed oscillation clock select
0: Internal high-speed oscillation
1: External high-speed oscillation
Select internal high-speed oscillation (set the bit from 1 to 0) when HRC-
CNT = 1.
Internal High-speed oscillation frequency select
00: 1 MHz
01: Setting is prohibited.
10: 8 MHz
11: 10 MHz
- Always read as "0"
Always set to "111".
External high-speed oscillation circuit control
0: Disabled (General-purpose port selected)
1: Enabled (OSC1/OSC2 selected)
Internal high-speed oscillation circuit control
0: Disabled
1: Enabled
4 3
- Reserved Reserved
0 1
R/W R/W
Description
Clock/ Mode/ Voltage Control
2 1
HOSCCNT HRCCNT
1 0
R/W R/W
Clock Control
Chapter 4
0
0
R/W
IV - 7