8-Bit Osc1 Timer Clock Control - Epson S1C17001 Technical Manual

7 OSCILLATOR CIRCUIT (OSC)

7.5 8-bit OSC1 Timer Clock Control

The OSC module consists of a division circuit for generating the 8-bit OSC1 timer operation clock and a device
for controlling the feed. The 8-bit OSC1 timer is a programmable timer that operates only using the OSC1 division
clock. For detailed information, refer to "14 8-bit OSC1 Timer (T8OSC1)."
OSC1 clock
Clock division ratio selection
Select the OSC1 clock division ratio using T8O1CK[2:0] (D[3:1]/OSC_T8OSC1 register)
∗ T8O1CK[2:0]: T8OSC1 Clock Division Ratio Select Bits in the T8OSC1 Clock Control (OSC_T8OSC1)
Register (D[3:1]/0x5065)
Clock feed control
The clock feed to the 8-bit OSC1 timer is controlled using T8O1CE (D0/OSC_T8OSC1 register).
The T8O1CE default setting is 0, which stops the clock feed. Setting T8O1CE to 1 sends the clock generated as
above to the 8-bit OSC1 timer. Stop the clock feed to reduce power consumption if 8-bit OSC1 timer operation
is not required.
∗ T8O1CE: T8OSC1 Clock Enable Bit in the T8OSC1 Clock Control (OSC_T8OSC1) Register (D0/0x5065)
60
Division circuit
(1/1 to 1/32)
Division ratio selection
Figure 7.5.1: 8-bit OSC1 timer clock control circuit
Table 7.5.1: T8OSC1 clock division ratio selection
T8O1CK[2:0]
0x7 to 0x6
0x5
0x4
0x3
0x2
0x1
0x0
EPSON
Gate
8-bit OSC1 timer
On/off control
Division ratio
Reserved
OSC1-1/32
OSC1-1/16
OSC1-1/8
OSC1-1/4
OSC1-1/2
OSC1-1/1
(Default: 0x0)
S1C17001 TECHNICAL MANUAL