S-7750C Datasheet, PDF (11/44 Pages) Seiko Instruments Inc – PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT)

PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E²PROM CIRCUIT)
Rev.1.1_00
S-7750C
„ Configuration of Command
If setting TA / C , the bit for timer address setting / command switch, in “0”, address / command (C2, C1, C0) is
recognized as command. There are 8 types of command, and Read / Write in each register is done by them. If setting
the bit for timer address setting / command switch (TA / C) in “1”, the S-7750C recognizes this command as timer setting
for DO0 to DO7.
Table 11 List of Command
Command
TA / C C2 C1 C0 R / W
Data
B7 B6 B5 B4 B3 B2 B1 B0
Reload ( R / W fixed to 0)
0
0
0
0
W
－^*1
Switching access to register / E²PROM 0
0
0
1 0 / 1^*2
－^*1
Timer enable register
Do not use (Do not access)
Free area 1^*3
Control port^*3
Timer scale setting^*3
Free area 2^*3
Timer setting for DO0^*3
Timer setting for DO1^*3
Timer setting for DO2^*3
Timer setting for DO3^*3
Timer setting for DO4^*3
Timer setting for DO5^*3
Timer setting for DO6^*3
Timer setting for DO7^*3
0
0
1
0
W ^{TEN7 TEN6 TEN5 TEN4 TEN3 TEN2 TEN1 TEN0}
0
0
1
1
－
－
0
1
0
0 _{R / W} F17 F16 F15 F14 F13 F12 F11 F10
0
1
0
1 _{R / W} CTR7 CTR6 CTR5 CTR4 CTR3 CTR2 CTR1 CTR0
0
1
1
0 _{R / W} TS7 TS6 TS5 TS4 TS3 TS2 TS1 TS0
0
1
1
1 _{R / W} F27 F26 F25 F24 F23 F22 F21 F20
1
0
0
0 R / W 8×T 7×T 6×T 5×T 4×T 3×T 2×T 1×T
1
0
0
1 _{R / W} 8×T 7×T 6×T 5×T 4×T 3×T 2×T 1×T
1
0
1
0 _{R / W} 8×T 7×T 6×T 5×T 4×T 3×T 2×T 1×T
1
0
1
1 _{R / W} 8×T 7×T 6×T 5×T 4×T 3×T 2×T 1×T
1
1
0
0 _{R / W} 8×T 7×T 6×T 5×T 4×T 3×T 2×T 1×T
1
1
0
1 R / W 8×T 7×T 6×T 5×T 4×T 3×T 2×T 1×T
1
1
1
0 _{R / W} 8×T 7×T 6×T 5×T 4×T 3×T 2×T 1×T
1
1
1
1 _{R / W} 8×T 7×T 6×T 5×T 4×T 3×T 2×T 1×T
*1. By inputting dummy data, the master device sends data in 18-bit during transmission. However, the S-7750C executes
the command when it has loaded 9-bit. Regarding acknowledgment, refer to “„ Operation 4. Acknowledgment”.
*2. R / W = “0”; register access mode, R / W = “1”; E²PROM access mode
*3. To switch access to register / E²PROM, use the “Switching access to register / E²PROM” command. When rewriting the
E²PROM, the register is rewritten simultaneously.
„ Register and E²PROM
In the S-7750C, the register and the E²PROM correspond each other. The S-7750C maintains the default value for control
despite power-off due to the included E²PROM. The data in the register is installed in the E²PROM by using the reload
command. And the data in the E²PROM is automatically installed into the register when power-on and the lower power
supply voltage is applied. Restoring the default value for control is possible any time due to these functions.
These 12 commands have the configuration in which the register and E²PROM correspond.
・Free area 1, 2
・Control port
・Setting for timer scale
・Timer setting for DO7 to DO0
Users are able to switch access between corresponding register and E²PROM by the “Switching access to register /
E²PROM” command. Immediately after power-on, the S-7750C is in the “register access mode”. In this register access
mode, only the register is rewritten, the E²PROM maintains the prior data. But in the “E²PROM access mode”, data both in
the register and the E²PROM is rewritten. In data Read, access mode data which is being selected by user; is read.
Seiko Instruments Inc.
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